1. "used to do sth." 表示 "过去常常做某事"。

2. "be used for" 表示 "被用来…"。

3. "be used as" 表示 "被作为…使用"。

4. "be used to doing" 表示 "习惯做某事"。

5. "be used by" 表示 "被…使用"。

Use 作为及物动词，可以接名词或代词作宾语，也可以接由 "as" 短语或动词不定式充当的补足语的复合宾语。偶尔，use 也可以接人作宾语，意为 "利用某人"，即把某人作为手段或工具。

"used to" 仅用于一般过去时，表示过去常常发生的事。其否定式为 "used not to" 或 "did not use to"。

扩展资料：

- use 的第三人称单数形式为 "uses"。

- use 的复数形式为 "uses"。

- use 的现在分词形式为 "using"。

- use 的过去式形式为 "used"。

- use 的过去分词形式为 "used"。

The word "use" entered English in the mid-14th century, directly from Old French "user", meaning to use, practice, or exercise. It initially derived from late Latin "usare", meaning to use. The words "use", "apply", and "employ" all carry the meaning of "use" or "apply". Their distinctions are as follows:

1. "Use" is a general term that emphasizes the utilization of a person or thing to achieve a certain purpose.

2. "Apply" refers to the application of one thing to another to achieve its most effective use.

3. "Employ" refers to the use of a person or thing that is in a passive state or has not been used, and can be used interchangeably with "use". It emphasizes the act of choosing and making full use.