... ...
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...
4 Put the verbs in brackets into the correct form.
1) We ... (to have) the conference since ten o'clock. 2) The
boys ... (to fish) for three hours now. 3) ... Jane ... (to skate)
since four o'clock? No, she 4) ... they (build) the
house for a year now? Yes, they . 5) How long ... you
(to watch) the race? - I ... (to watch) the race for twenty
minutes now. 6) What ... they (to do) since morning?
They (to decorate) the hall for the party. 7) With whom ..
Fred ... (to play) tennis? He (to play) tennis with Dick.
8) Whose call ...
Cathy (to wait) for? She (to wait)
for a call from her boss. 9) The doctors (to operate) on
the patient for five hours now. 10) How long the police
(to investigate) this murder? They. (to investigate) this
murder for three weeks.
.
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