we must be successful.如果用你句中的动词success, 那就只能用原型，因为你有情态动词can
We are certain that you will succeed. We are certain of your success. It's certain that you will be succeed. You are certain to succeed.
不对。 success是名词。 它的动词是succeed。can 是情态动词后加动词原形，不能用名词。正确： We can certainly succeed/ make it.
I believe I can finish it finally
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winwing168
