1. They …….. chess for two hours. (play)
(+) They have been playing chess for two hours.
(-) They haven’t been playing chess for two hours.
(?) Have they been playing chess for two hours?
2. The secretary ……... letters since this morning. (type)
(+) The secretary has been typing letters since this morning.
(-) The secretary hasn’t been typing letters since this morning.
(?) Has the secretary been typing letters since this morning?
3. Mr. Smith ………. his car for five hours. (drive)
(+) Mr. Smith has been driving his car for five hours.
(-) Mr. Smith hasn’t been driving his car for five hours.
(?) Has Mr. Smith been driving his car for five hours?
4. The boys ……… kites since 10 o’clock. (make)
(+) The boys have been making kites since 10 o’clock.
(-) The boys haven’t been making kites since 10 o’clock.
(?) Have the boys been making kites since 10 o’clock?
5. The participants …….. the problem for one hour. (discuss)
(+) The participants have been discussing the problem for one hour.
(-) The participants haven’t been discussing the problem for one hour.
(?) Have the participants been discussing the problem for one hour?
By : tatank,
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