例如:
用在學術界, 法律, 醫學
Introductory verbs – seem, tend, look like, appear to be, think, believe, doubt, be sure, indicate, suggest
Certain lexical verbs – believe, assume, suggest
Modal Adverbs – possibly, perhaps, conceivably
That clauses – It could be the case that…, it might be suggested that…, there is every hope that…