use to 和 be use to用法 (20點)

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be (am, is, was, were, will be) used to + noun (or pronoun or verb-ing)

“be used to” 表示 “習慣了” 相等 “be accustomed to” 這個 ”to” 字在這裡是 preposition (前置詞), 不是 infinitive (不定詞), 其後可接 noun (名詞), pronoun (代名詞) or gerund (動名詞), ”used” 在這裡是 adjective, (用 past participle 作形容詞) , 不能用 use, 這片語 (phrase) 可用各種的時態

I was used to this sort of thing. (past tense)
I am not used to eating so much at lunchtime. (present tense)
You will soon be used to working in the new laboratory. (future)

“used to” + infinitive

“used to” + infinitive 過去 (past) 經常發生動作 (action) 或狀態 (state). 相當 “過去一向…” 這種動作或狀態現在不再繼續. 是 past tense
因為 to 是作 infinitive, 後面動詞是用 verb 的 base form, (不是 past tense, past participle, or gerund i.e. verb-ing)

He used to live in London.
You used to see a lot of her, didn’t you?

negative 時, 用 use 不用轉 used (did not use to ... )
I didn’t use to like him when we were at school.

下列兩句子意思不同
I used to drive in New York City. (過去一向, to 後面動詞用 basic form, drive, 不是 drove, driven, drives, driving )
I am used to driving in New York City. (習慣了, to 後面動詞用 gerund, driving, 不是 drive )

其他的用法::
(1) “Use to”:
Use 作 noun, to 作 preposition
You can throw those away - they are no use to anyone.

(2) "be used to" 作 passive voice
What can be used to detect early cancer?
used 是 past participle. to 作 infinitive

use to過去常常 ·雙語例句1. I don't want it, but it may be of use to someone. 我不想要它，但它可能對某人有用。2. This medicine is of no use to me. 此藥對我無用。be used tov. 習慣于，適用於 ·雙語例句1. Asbestos can be used to insulatea cooking stove. 石棉能用來使烹調用的爐灶絕熱。來自《簡明英漢詞典》2. This cream can be used to treatsundry minor injuries. 這種藥膏可用來治各種輕傷。