Question

Put the verbs in brackets into the present indefinite present continuous present perfect or present perfect continuois tenses helen(to learn) english at the institute. she (learn) english since last summer/ Theu are busy now. They (to discuss) an important question. They (to discuss)in since 5 0"clock . Where is Peter? -He (towork) in the library.-He (to work) long? -Yes, he (to work) there for ten days. He (to teach) French. He is a very experienced teacher . He (To teach) French for fifteen years. I (to know) Peter well.- Since when you (to know) him? I (To know )him since 1940

Answer 1

Learned / has been learning
are discussing / have been discussing
is working / has he worked a long? / he has been working
teaches / has been teaching
know / have you known  / have known

Честно говоря, меня немного поставила в тупик эта часть: He (to work) long?
Возможно ты что-то пропустила там. По логике должен был быть вопрос "Как долго он уже работает" - "How long has he worked?" Но на этот вопрос не может быть ответа, который следует дальше (-Yes, he...) Так что здесь возможен косяк. Остальное, надеюсь, сделал правильно))

Answer 2

Present Indefinite Tense:

- Helen learns English at the institute. She learns English since last summer. - They discuss an important question. They discuss since 5 o'clock. - He works in the library. He works long. - He teaches French. He is a very experienced teacher. - I know Peter well. Since when you know him? I know him since 1940.

Present Continuous Tense:

- Helen is learning English at the institute. She has been learning English since last summer. - They are discussing an important question. They have been discussing since 5 o'clock. - Where is Peter? - He is working in the library. - He has been working long? - Yes, he has been working there for ten days.

Present Perfect Tense:

- Helen has learned English at the institute. She has learned English since last summer. - They have discussed an important question. They have discussed since 5 o'clock. - Where is Peter? - He has worked in the library. - He has worked long? - Yes, he has worked there for ten days. - He has taught French. He is a very experienced teacher. - I have known Peter well. Since when you have known him? I have known him since 1940.

Present Perfect Continuous Tense:

- Helen has been learning English at the institute. She has been learning English since last summer. - They have been discussing an important question. They have been discussing since 5 o'clock. - Where is Peter? - He has been working in the library. - He has been working long? - Yes, he has been working there for ten days. - He has been teaching French. He is a very experienced teacher.

Note: The search results provided by You.com do not include specific snippets for each sentence. However, the verb forms used in the response are based on the general rules and usage of the respective tenses.