provided that用法

provided that的用法：当表示事实相符的真实语气时，意为“只要”that不可省略；当表示与事实相反的虚拟语气时，意为“假如、假设”that可以省略；作为固定搭配时，意为规定。

意为假如、设若，从主语位置来看，provided that为被动，从时态上来看，provided that为过去时。

1、有时候表示事实相符的真实语气，例如：

We shall go provided that the weather is fine.

只要天晴, 我们就去。

Suppose he can't come, who will do the work?

如果他不能前来, 谁来做这项工作呢?

A Web application is provided that allows the operating system service to be easily invoked.

它提供了一个Web应用程序，使操作系统服务易于调用。

Is enough information provided that a tester could create tests to verify its operation?

提供测试人员可以创建测试来验证其操作的足够的信息了吗？

I will agree to go provided that ( providing that) my expenses are paid.

如果帮我支付费用，我就同意去。

2、多数情况下表示与事实相反的虚拟语气，例如：

Provided it was fine we would have a pleasant holiday.

如果天气好, 我们的假日真的有可能过得非常愉快。

I will go abroad on condition that my husband goes with me, but he said he wouldn’t.

如果我丈夫能和我一起去, 我就出国，但是他说他不愿意。

The meeting would be put off in case it should rain.

若遇下雨, 会议延期举行。

Provided that you exercise due care, there is no reason why you shouldn't live to a great age.

只要你适当地注意，你完全可能享有很高的寿命。

And it was easy enough, provided that you could avoid being caught in the act.

而且逃起来也容易，谁会在搞事儿的时候给人当场擒拿？