You have to be careful what you say on TV.
在电视上说话时你不得不谨慎。
Bathrooms don't have to be purely functional.
浴室不必完全只为了实用。
Premature babies have to be fed intravenously.
早产儿必须通过静脉输入来喂食。
have to be是什么时态
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You have to be careful what you say on TV.
在电视上说话时你不得不谨慎。
Bathrooms don't have to be purely functional.
浴室不必完全只为了实用。
Premature babies have to be fed intravenously.
早产儿必须通过静脉输入来喂食。