I've got to tell you whether I went to the right or whether I went to the left.

我必须告诉你,我是向右走还是向左走的

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but you have a prior engagement and you really must be going, you can say,

但是你已有约在先，你真的必须走了，你可以说，

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You can tell your partner that you must finish this project before you leave.

你可以告诉你的伙伴，你走之前必须完成这个项目。

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You have to go out of your comfort zone.

你必须从你觉得舒服的感觉里走出来。

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