9. i havent decided yet.
10. she has learned a lot today.
exercise 4: complete using present perfect + signal words
word bank - signal words
already · ever · never · for · since · yet · so far · up to now · recently · just · lately · today · this month · up till now
1. i havent finished (not / finish) the book yet.
2. she (study) english (for) five years.
3. they (visit) three countries.
4. he (never,try) sushi.
5. we (know) each other middle school.
6. my teacher (explain) the lesson.
7. i (not / see) that app.
8. she (work) here.
9. have you (ever / break) your phone?
10. the team (make) good progress

Question

Accepted Answer

### Question 2
# Explanation:
## Step1: Determine the tense and subject-verb agreement
The sentence is in the present perfect tense. The subject "She" is third - person singular, so the structure of the present perfect tense is "has + past participle". The verb "study" has a past participle of "studied". And we use "for" to indicate a period of time (five years).
## Step2: Form the sentence
So the sentence should be "She has studied English for five years."
# Answer: has studied; for

### Question 3
# Explanation:
## Step1: Determine the tense and subject-verb agreement
The subject "They" is plural, and the present perfect tense structure for plural subjects is "have + past participle". The past participle of "visit" is "visited". We can choose a signal word from the word bank, for example, "so far" which is suitable for present perfect tense to indicate an action up to the present.
## Step2: Form the sentence
So a possible sentence is "They have visited three countries so far." (Other signal words like "up to now", "lately" etc. can also be used as long as they fit the present perfect tense context.)
# Answer: have visited; so far (answers may vary with other valid signal words)

### Question 4
# Explanation:
## Step1: Determine the tense and subject-verb agreement
The subject "He" is third - person singular, and the present perfect tense structure is "has + past participle". The word "never" is used with the present perfect tense, and the past participle of "try" is "tried".
## Step2: Form the sentence
So the sentence is "He has never tried sushi."
# Answer: has never tried

### Question 5
# Explanation:
## Step1: Determine the tense and subject-verb agreement
The subject "We" is plural, and the present perfect tense structure is "have + past participle". The past participle of "know" is "known". We use "since" to indicate a starting point in time (middle school).
## Step2: Form the sentence
So the sentence is "We have known each other since middle school."
# Answer: have known; since

### Question 6
# Explanation:
## Step1: Determine the tense and subject-verb agreement
The subject "My teacher" is third - person singular, and the present perfect tense structure is "has + past participle". The past participle of "explain" is "explained". We can choose a signal word from the word bank, for example, "already" which is suitable for present perfect tense to indicate that an action has been completed.
## Step2: Form the sentence
So a possible sentence is "My teacher has explained the lesson already." (Other signal words like "just", "recently" etc. can also be used as long as they fit the present perfect tense context.)
# Answer: has explained; already (answers may vary with other valid signal words)

### Question 7
# Explanation:
## Step1: Determine the tense and subject-verb agreement
The subject "I" is first - person singular, and the present perfect tense negative structure is "have not + past participle" (contracted as "haven't"). The past participle of "see" is "seen". We can choose a signal word from the word bank, for example, "yet" which is often used in negative present perfect sentences to indicate that an action has not happened up to now.
## Step2: Form the sentence
So the sentence is "I haven't seen that app yet." (Other signal words like "lately" (in negative context) etc. can also be used as long as they fit the present perfect tense context.)
# Answer: haven't seen; yet (answers may vary with other valid signal words)

### Question 8
# Explanation:
## Step1: Determine the tense and subject-verb agreement
The subject "She" is third - person singular, and the present perfect tense structure is "has + past participle". The past participle of "work" is "worked". We can choose a signal word from the word bank, for example, "for" (if we want to indicate a period of time, e.g., "for five years" but since no specific time is given, we can also use "lately", "recently" etc. Here we take "for" as an example, assuming a period of time is implied.
## Step2: Form the sentence
So a possible sentence is "She has worked here for (a while)" (or with other signal words like "lately" as "She has worked here lately").
# Answer: has worked; for (answers may vary with other valid signal words)

### Question 9
# Explanation:
## Step1: Determine the tense and subject-verb agreement
The sentence is a present perfect tense question. The structure of present perfect tense in questions is "Have/Has + subject + past participle". The word "ever" is used in present perfect questions, and the past participle of "break" is "broken".
## Step2: Form the sentence
So the sentence is "Have you ever broken your phone?"
# Answer: ever broken

### Question 10
# Explanation:
## Step1: Determine the tense and subject-verb agreement
The subject "The team" is considered as a single unit (collective noun), so the present perfect tense structure is "has + past participle". The past participle of "make" is "made". We can choose a signal word from the word bank, for example, "so far" which is suitable for present perfect tense to indicate an action up to the present.
## Step2: Form the sentence
So a possible sentence is "The team has made good progress so far." (Other signal words like "up to now", "lately" etc. can also be used as long as they fit the present perfect tense context.)
# Answer: has made; so far (answers may vary with other valid signal words)

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Question 2

Step1: Determine the tense and subject-verb agreement

Step2: Form the sentence

Step1: Determine the tense and subject-verb agreement

Step2: Form the sentence

Step1: Determine the tense and subject-verb agreement

Step2: Form the sentence

Answer:

Question 3