Each和Every我们都是使用单数的，例如：
◆ Right: Every dog HAS paws.
◆ Right: Every dog and cat HAS paws.
◆ Right: Each of these shirts IS pretty.
但是当each跟着主语时其情况视主语而定：
They each ARE great tennis players.
Each和Every我们都是使用单数的，例如：
◆ Right: Every dog HAS paws.
◆ Right: Every dog and cat HAS paws.
◆ Right: Each of these shirts IS pretty.
但是当each跟着主语时其情况视主语而定：
They each ARE great tennis players.
