1、…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。

2、我深信…

i am greatly convinced (that)子句=i am greatly assured (that)子句

3、…是很容易证明的。

it can be easily proved (that)子句