Question

1. When we …(see) … them last night, they …(sing)… ; they …(say)… they
…(sing)… since six o’clock.
2. We …(wait)… for you when you …(get)… back tomorrow.
3. They …(not come)… home until they …(see)… everything.
4. What do you think the children …(do)… when we get home ?
5. I’m sure the letter won’t arrive in time unless it …(send)… by air.

Answer 1

1. When we …(see) saw… them last night, they …(sing)were singing… ; they said…(say)… they
…(sing) had been singing… since six o’clock.
2. We …(wait)…will be waiting for you when you …(get)get… back tomorrow.
3. They …(not come)won't come… home until they …(see)…see everything.
4. What do you think the children …(do)will be doing… when we get home ?
5. I’m sure the letter won’t arrive in time unless it is sent…(send)… by air.

Answer 2

1. When we …saw(see) … them last night, they …have sung(sing)… ; they …(say)have seen… since six o’clock.
2. We …(wait)will wait… for you when you …get(get)… back tomorrow.
3. They …(not come)don't come… home until they …see(see)… everything.
4. What do you think the children ....are doing.....(do)… when we get home ?
5. I’m sure the letter won’t arrive in time unless it ...sends...(send)… by air.

Answer 3

1. When did we …see (see) … them last night, they …have sung (sing)… ; they …have said (say)… they
…have sung (sing)… since six o’clock.
2. We …(wait)…are waiting for you when you …get (get)… back tomorrow.
3. They …(not come)don't come … home until they …see (see)… everything.
4. What do you think the children do …(do)… when we get home ?
5. I’m sure the letter won’t arrive in time unless it send …(send)… by air.