1 I go
2 She cleaned
3 They are writting
4 We will buy
Yes, they were
They were skating
The children were skating on the pond in the park
The children were skating at 12 o'clock
The letter will have been typed.- b) future perfect.
I have been digging in the garden since morning. - я копаю в саду с самого утра.
present perfect continuous tense
настоящее совершенное продолженное время
действие длится с самого утра и по сей час
<span>You must follow the instructions of the staff of the zoo
You must treat other visitors with consideration
You must keep the zoo tidy</span>
<span /><span>You mustn't feed animals
You mustn't touch animals
You mustn't disturb animals with noise or other inconvenient behaviour
</span>