You should pay 1000 dollars monthly for your room.

你每月要付1000美元的房租。

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You can choose to pay annually for the full year or monthly.

您可以选择按年支付全年费用或按月支付。

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The agency will pay you a monthly retainer.

这个机构将会每月付给你聘用金。

《牛津词典》

When you buy a house, you borrow the money and you pay it back in fixed-- it would usually be monthly, but let's say annual payments.

当你买了一座房子,你贷了些款,然后你在一定的时间内偿还一部分,一般来说都是按月来算的,但是假设我们是按年支付的

耶鲁公开课 - 金融市场课程节选

If you are in good health, it is worth considering that most insurance companies have health plan options that allow you to pay lower monthly premiums if you agree to pay more out-of-pocket expenses, such as a yearly deductible and co-insurance for services and prescription medications.

FORBES: How To Get Affordable Insurance

Plus, as the only network to offer all-you-can-eat data on both Pay as you go and Pay monthly, Three customers can enjoy all of the rich content that YouTube, BBC iPlayer and Spotify have to offer without ever having to worry about data limits.

ENGADGET: Sony Xperia S available now from Three UK Mobile

You put down money now in return for a promise from an insurer to pay you monthly sums beginning when and if you reach some greater age.

FORBES: A 10% Annual Payout For Retirees