我答应要经常写信。用英语怎么说？

我答应要经常写信。

I promised that I would write regularly.

promised

vt.& vi. (promise的过去式或过去分词形式)，承诺，允诺，答应；v. 允诺( promise的过去式和过去分词 )，答应，有…希望，预示；

例句
They have promised to pay the arrears over the next five years...
他们保证在随后的5年内偿付逾期债款。

that

det. 那个，那；pron. 那个，那；conj. 多么，如此…以至，用于某些动词、形容词和名词后，引出各种从句；adv. 不那么，那样；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

would

aux. 将，将要，愿意，会，打算，大概；v. (will 的过去式，用于转述)将；

例句
I would love to go abroad this year, perhaps to the South of France.
我今年很想出国，可能是去法国南部。

write

vt.& vi. 写，写信，写作，作曲；

例句
The clinic doctor will then write to your GP to get his agreement.
然后门诊医生将会写信给你的全科医生以取得他的同意。

regularly

adv. 有规律地，按时，照例，按部就班地，整齐地，有条不紊地，经常，不断地，定期地；

例句
Their sleep is regularly disturbed by the sound of gunfire as criminal gangs settle their nightly accounts.
他们经常被黑帮每晚火拼的枪声所吵醒。