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if; will be if; is unless; shall be unless; is
what did he say at the meeting what had he said at the meeting what he said at the meeting what he would say at the meeting
because because of which to which because of that
he must to teach a class he will be teaching a class he will teach a class he will have teaching a class
came to; attend to attend; attend join; treat attend on; look after
should he come he will come to here if he will come will he come
attend join participate in take part in
will attend attends is to attend will be attending
He was busy He being busy Because of busy Being busy
came to; attend to attend; attend join; treat attend on; look after
will attend had attended would have attended would attend
likely possible probable maybe