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1. 不用说，…

It goes without saying that子句

= (It is) needless to say (that)子句

= It is obvious that子句

= Obviously, S. + V.

例︰不用说早睡早起是值得的。

It goes without saying that it pays to keep early hours.

2. …是不可能的; 无法…

There is no Ving

= There is no way of Ving.

= There is no possibility of Ving.

= It is impossible to V.

= It is out of the question to V.

= No one can V.

= We cannot V.

例︰不可否认的¸成功的事业关键在于健康的身心。

There is not denying that successful business lies in a healthy body and mind.

3. 我深信…

I am greatly convinced (that)子句

= I am greatly assured (that)子句

例︰我深信预防是于治疗。

I am greatly convinced that prevention is better than cure.