我可以向你保证他是诚恳的.

I can assure you that he is sincere.

我喜欢他是因为他很诚恳。

It is because he is sincere that I like him.

我深深地感谢你诚恳的帮助。

I I deeply appreciate your sincere help.

她为人诚恳,毫不矫揉造作.

She is sincere and quite without affectation.

可以认为他们是诚恳的.

It may be taken for granted that they were sincere.

做生意诚恳做一笔交易

Trade with do do business in business in a sincere way

去告诉他们。态度要真诚、诚恳。

Go up to them and say it. Be genuine, be sincere.

她实在喜欢随和又诚恳的人。

She really likes people that are easygoing and sincere.

不过最重要的建议就是要诚恳。

The most important of these suggestions, however, is simply to be sincere.

他诚恳地向她表示了感谢.

He thanked her sincerely.