I'll try but I can't promise.
我争取去，但不能保证。
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今天的几个句子是有关约定的：1.You can't tell anyone. 你不能告诉任何人。2.Remember to bring the report. 记住带上你的报告。3.A promise is a promise! 说到就得做到。4.You can't go back on your promise now! 你现在不能食言