3句英文任你选

Please don't hesitate to call us whenever you want.
请别犹豫，我们随时恭候您的来电。

Please let us know if you would like to take the matter further.
如感兴趣请联系我们。

Your prompt reply will be greatly appreciated.
如能尽快回复将不胜感激。

半个句型要记牢

don't hesitate to do (及时……，别犹豫做某事)

Tip:

此句型一般是结束前的客套用语，如please do not hesitate to contact me if you have any questions. (有任何问题，请及时联系我。)另外hesitate后面接 at doing sth，表示"做某事时犹豫不决"。