__what duo you call this in English?___It's a stamp .It's used _____sending letters.( 为什么这里要用FOR .不用TO.)sth be used to doing 也指被用来做=be used for

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__what duo you call this in English?___It's a stamp .It's used _____sending letters.( 为什么这里要用FOR .不用TO.)sth be used to doing 也指被用来做=be used for
__what duo you call this in English?___It's a stamp .It's used _____sending letters.
( 为什么这里要用FOR .不用TO.)
sth be used to doing 也指被用来做=be used for

__what duo you call this in English?___It's a stamp .It's used _____sending letters.( 为什么这里要用FOR .不用TO.)sth be used to doing 也指被用来做=be used for
for 表原因
而be used to doing 表过去经常做的事
显然用for比较清楚,也让人明白

这里是被动语态,表示用来干什么的,用for
而be used to doing sth是固定用法,表示过去常常做某事

used to 是惯用搭配,一般表示习惯于,或过去常常!而be used for则表示为适用于doing sth!