The first two lines are contemplations on life and are supposed to be very profound. The boys do do their homework after school every day. 有do就没to，没do就有to 当but前的谓语结构是do时，或者定语从句中有do时，but后面不用to there is nothing to do but stay here.
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用 助动词 do 的场合：一般现在时的疑问句，否定句、一般过去时的疑问句，否定句，如： 1.一般现在时的否定式：he doesn't get up early everyday. Do、re、mi、fa、sol、la、si的学名唱名：1 2 3 4 5 6 7 音名：c d e f g a b 唱作：do re mi fa so la si 叫做“基本音级”。 被广泛采用的音名,除了c d e f g a b之外,还有do re mi fa sol lasi。 这. Do和does的区别和用法区别是：do 是动词原形，用于第一人称、第三人称的复数 (i/you/we/they)。does 用于第三人称单数 (he/she/it) does 用于第三人称单数。do用于一般现.
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Help to do sth.：词性为动词短语，该短语中的help后面跟着不定式（to do），表示主动帮助他人完成某件事情。 help doing sth.：词性为动词短语，该短语中的help后面跟着动名词（doing），. I have no choice but to stay here. They were spoken by very famous philosophers. Statin side effects can be uncomfortable but are rarely dangerous.
— socrates to do is to be. Do their homework 做作业，do do their homework 确实有做作业，主语是 they ，故用 do 对do their homework中的do 进行强调：确实. To be is to do. Means, but what does d.o.
