When the frog knew the girl wanted something to eat, the frog promised to help her.

得知女孩想吃东西后，青蛙答应帮助她。

youdao

If he promised to help, he will not go back on his promise.

如果他答应帮忙，他就不会食言。

《新英汉大辞典》

They promised to help out with the preparation.

他们都保证帮我做准备工作。

youdao

Finally, a friend promised to help her meet a well-known voice teacher.

VOA: special.2009.01.18

Indonesian authorities have promised to help residents rebuild their homes.

VOA: standard.2009.03.28

But the Treasury secretary has promised fifty billion dollars to help people keep their homes.

VOA: special.2009.02.13

The United States has promised to help the effort, Defense Secretary Leon Panetta said Monday.

CNN: France, Germany and Italy: Terrorists in Mali must go

The United States has promised to help the French effort, Defense Secretary Leon Panetta said Monday.

CNN: France, Germany and Italy: Terrorists in Mali must go

The government has promised to help UK businesses "compete" more effectively in the global nuclear energy market.

BBC: Nuclear power: UK will get help to compete, say ministers