Question

1. we ________________ (not / finish) the test yet.
2. he ________________ (take) several online classes.
3. scientists ________________ (discover) new uses for ai.
4. my best friend ________________ (lose) her phone.
5. the class ________________ (practice) speaking a lot.
6. she ________________ (not / travel) outside the country.
7. you ________________ (make) great progress this semester.

exercise 3: choose the correct signal word

word bank - signal words
already · ever · never · for · since · yet · so far · up to now · recently · just · lately · today · this week

1. i have lived in this city ________ ten years.

1. she has ________ finished her homework.

1. have you ________ used a 3d printer?

1. they haven’t fixed the problem ________.

1. he has worked here ________ 2021.

1. we have ________ seen that movie.

1. ________, no one has answered the email.

1. my brother has ________ been late to class.

Explanation:

Exercise 2 (Verb Tense Fill - ins, Present Perfect)

4.

Step1: Identify tense (Present Perfect, negative).

We use "have + not + past participle". "Finish" past participle is "finished".
<We haven't finished>

Step2: Combine with subject "We".

<We haven't finished the test yet.>

Step1: Tense is Present Perfect. "Take" past participle is "taken".

<He has taken>

Step2: Add object and context.

<He has taken several online classes.>

Step1: Present Perfect, "discover" past participle "discovered".

<Scientists have discovered>

Step2: Add object.

<Scientists have discovered new uses for AI.>

Answer:

haven't finished

5.