Почвы и растительность саванн зависят от продолжительности сезон дождей. Ближе к экваториальным лесам ,где сезон дождей длится 7-9 месяцев ,образуются красные ферраллитные почвы. Травы достигают 3 метра в высоту. Там, гд продолжительность сезона дождей менее 6 месяцев, распространены типичные саваны с красно- бурыми почвами , с не очень высокими травами. На границе с полупустынями , где скудные дожди выпадают всего 2-3 месяца, образуются опустененные саванны с сухими колючими кустарниками и редкостоящими жесткими травами.
Объяснение:
1. Put the verbs in brackets into the Present Simple of Present Continuous.
1) The plane (set) off in 5 minutes.
2) He (go) to the party tonight?
3) She (know) him well?
4) They (have) the dinner tomorrow evening?
5) Jane usually (play) soccer on Mondays after school.
2. Complete the sentences with the correct present forms of the verbs in brackets.
1) She ___ (cook) the dinner during three hours.
2) ___ (your friend like) basketball?
3) I ___ (not hear) from you recently.
4) We ___ (already/buy) the tickets for the new show.
5) I (do) my homework now.
3. Choose the correct answer.
1) Sarah ___ for a new flat at the moment.
2) He___ tennis every day.
3) She __ her homework for 2 hours.
4) They ___ for a new one at the moment.
5) Jane ___at the library for ten years.
1) looks
has been looking
is looking
2) play
has played
plays
3) has done
is doing
has been doing
4) look
have been looking
are looking
5) has been working
has been worked
have been working
4. Match the tenses and time markers.
1) Present Simple a) Yet, already, since
2) Present Continuous b) For, all day
3) Present Perfect c) Usually, never , often, sometimes
4) Present Perfect Continuous d) Now, these days
5. Choose the correct answer.
1) This man is a writer. He has written/writes books.
2) He is writing/has been writing books for 10 years.
3) She always helps/has been helping her mother about the house.
4) He is already writing/has already written 10 books.
5) Is he playing/Has he played chess at the moment?
6.
Put the verbs in brackets in the correct form.
1) Today Sue (help) her mother all morning.
2) They already (wash) the floor.
3) Now we (cook) dinner together.
4) They (work) in the local store.
5) They (work) there for three hours.
7. Choose the correct answer.
1) She is dusting/has been dusting the furniture for an hour.
2) The climate has changed/changes lately.
3) He are /is not tired at the moment.
4) How are you doing/is you doing now?
5) She has just bought/has just buying the new dress.
8. Choose the correct answer.
1) (you already find) your notebook?
2) Lisa (be) a good girl.
3) He (forget) to write an essay for today.
4) I (look) for his book at the moment.
5) I (cook) the dinner for 2 hours.
1) Have you already found
Do you already find
Having you already find
2) are not be
is
have to be
3) have forgotten
forgets
has forget
4) is looking
looks
have looked
5) have been cooked
have been cooking
am cooking