1.able to能做 ...

例句：At this rate we won't be able to afford a holiday.
照这样下去，我们不会有时间／钱去度假的。

2.By this time到这时；此时

例句：By this time he realized that Tom was not with him.
到这时他才意识到汤姆没和他在一起。

3. endeavour to 尽力(力图；争取)

例句：On account of your health, you must endeavour to shift off the care of your children.
由于你身体不好，你必须尽量避免为孩子们操心。

4.flatter oneself自以为(自吹)

例句：I flatter myself that I have spared no pains.
我自问是花过不少力气的。