答应的英文：
reply
promise

参考例句：

Did the Chamber of Commerce let him have it?
商会答应了么？

It's not feasible to comply, but a bit embarrassing to refuse
答应吧，办不到;不答应吧，又有点难为情。

The bank promised to strike off the interest of the debt.
银行答应免去这笔债务的利息。

The principal promised to investigate into that affair.
校长答应去调查那件事情。

Clyde would not agree to her proposal and grew more irritable and worried.
克莱德不肯答应而且变得愈加脾气暴躁和忧心忡忡了。

The airport authorities have promised to review their security measurements
机场当局已答应重新检查他们的安全措施

Mother promised to buy me an iPad but it fell to the ground because of my bad behavior.
妈妈原本答应给我买个iPad，但因为我表现不好而落空。

Respond By a nod
点头答应

promising to attend a meeting
答应参加会议

accede to a request
答应某人要求

reply是什么意思：
v. 回应，答复，做出反应
n. 回答，答复

Reply to the sender and all the recipients Reply to the sender and all the recipients Reply All
回复发件人和所有收件人，回复发件人和所有收件人，回复全部

Post reply to the Newsgroup and mail a reply to the author
将回复消息投递到新闻组并向作者回复一个邮件

His challenge draws no reply.
他的挑战没有引出回答。

He chose not to reply.
他决定不回答。

In business, a prompt reply is imperative.
在商业上迅速的回复是必要的。

promise是什么意思：
n. 许诺；希望，指望
v. 许诺；给人以…的指望或希望

His promise was faithfully kept.
他忠实地履行自己的诺言。

The preacher promised us eternity.
这传道士向我们许诺会有来世。

She recalled her promise.
她取消了约言。

Tom promised to school me.
汤姆同意担负我的学费。

A promise attended to is a debt settled
践约如同偿欠.