Check that the plug has not come loose.

检查一下别让插头松脱了。

Two wooden beams had come loose from the ceiling.

天花板上的两根木梁松动了。

The brake of your bicycle has come loose. You'd better fix it.

你自行车的刹车松了，你最好把它修好。

Your shoelace has come loose.

你的鞋带松了。

Several screws have come loose.

有几个螺钉松了。 （形容词作表语。）