How many birds can you see in the tree?你能看到树上有多少只鸟儿?
Look at the blackboard,please.请看黑板.
Can I hear your comment about this?我可以听一下你的意见吗?
listen to me听我说
I can't find my pen.我找不到我的笔了.
They are looking for a cat.他们在找一只猫.
I see the children playing football on the playground
我看见那些孩子正在操场上踢足球.
I heard someone singing when I passed by.
我经过这里时听到有人唱歌.