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))