因为这句话描述的是客观规律,是不会随着的时间而改变的,树在任何时候都是有用的,所以是is,如果用was的话,则是说树在以前是有用的,暗指现在是没用的,明显不符合客观事实.said是指这句话是过去说的
he said that the tree is a useful source of income.请问为什么是is
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