certainly, naturally, of course, surely
这些副词或词组均有“肯定地，当然”之意。
nly : 强调有把握，深信不疑。
例如：I will certainly see you into the train.（我一定要送你上火车。）
lly : 指自然而然，毫无造作或天生如此。
例如：One will naturally ask why.（人们当然要问为什么。）
course : 指毫无疑问，自然如此。可与certainly和naturally换用。
例如：He's denied having an affair with secretary but of course there's no smoke without fire.（他不承认他和他的秘书有染, 但是无风不起浪啊。）
no smoke without fire：无风不起浪
: 表一种必然的可能性，也可表示信心或不轻信。强调主观判断。
例如：It should surely be possible for them to reach an agreement.（想必他们可以达成协议。）
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