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could catch could have caught caught had caught
if only so that in case as long as
has been working is working has worked works
automatic flexible cautious typical
has been ill; was ill fell ill; has fallen ill fell ill; has been ill fell ill; is ill
ambitious roundabout stubborn straightforward
must have fallen asleep must fall asleep can’t been asleep must be asleep
has been ill; was ill fell ill; has fallen ill fell ill; has been ill fell ill; is ill
fallen behind fallen down fallen back fallen off
You’d better not I hope so That’s all right I think so
has been ill; was ill fell ill; has fallen ill fell ill; has been ill fell ill; is ill
such bad such a bad such good such a good
heard fallen escaped borrowed
could have fallen should have fallen must have fallen mustn't have fallen
could have fallen should have fallen must have fallen mustn’t have fallen
heard fallen escaped borrowed
to have fallen having fallen to fall falling
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