There is no suggestion of a. I don't understand this explanation from michael swan's practical english usage. Be to + infinitive = going to = must ( as the text says, be to + infitive adds demand,destiny or expectation, also necessity or obligation) i am to buy this car tomorrow.
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1.首先你的 游戏安装目录 不能出现中文，出现中文路径会导致游戏出现you must run the game from its install directory错误。 2.所以游戏的安装目录必须要命名为英文，才会避免游戏出错。
Needs must is listed in the oed with many reputable examples.
I sent you a message the other day that might.You use 'would', or 'would have' with a past participle, to indicate that you are assuming or guessing that something is true,. One of the uses of 'would' has been listed below:Does anybody know the question tag of the next sentence:
When talking about internal obligation, we can use either must or have to.Hi, i searched this forum before posting, and there are quite some threads as to the use of 'must', 'should' and 'have to' but none that really tells me what i'd like to know. But when talking about external obligation, we only use have to and not.We must confirm this by sending them a fax, __________?
