Be sure to do the sowing in good time.

确保适时播种。

A. be sure to do sth.

表示 “必然做某事”或“一定会……”。

B be sure to do STH.

有把握做某事，一定能干某事。

Be sure to do sth.

意思是“肯定会做某事”。

No matter what you do, be sure to do it well.

不管你做什么，一定要做好。