waste

1.It is (a) waste of time（或money，speech等）等句子里的a可有可无。

2.waste是“浪费”，跟spend不同，下面两句里的waste用得不对，该改作spend：

• You should learn to waste your money properly.
• I hope to waste a pleasant morning with you tomorrow.

3.waste my（或his等）time后面可以接现在分词。例如：He said I was wasting my time reading such books.