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be doing have done have been done have been doing
why was Tom late for school again whether we had too much homework how did she come to school this morning that we would have a test soon
have had were having are having will have
lost; have been training have lost; have trained were losing; had trained had lost; have trained
why was Tom late for school again whether we had too much homework how she did come to school this morning that we would have a test soon
if we have if have we if we had if had we
if we needed an umbrella when and where we shall meet how shall we get there what should we take
in, at in, in on, on on, at
in ; at on; in at; in at; at
we receive，not we have received，never did we receive，hardly had we received，certainly
have will have have had were having
we received did we receive we have received had we received
if we have if have we if we had if had we
if we have if have we if we had if had we
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