Для того, чтобы выразить свою уверенность, высказать предположения или поделиться сомнениями относительно настоящего или прошлого следует использовать слова  possible, probably, maybe, likely или конструкции типа:
must be, could be, may be, might be, can’t be
must be doing, could be doing, may be doing, might be doing, can’t be doing
must have done, could (not) have done, may (not) have done, might (not) have done, can’t have done
must have been doing, could (not) have been doing, may/might have been doing, can’t have been doing
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