let的过去式和过去分词

Now let me see ─ how old is she now?

让我想一想，她现在多大了呢？

Let's take the problems in a different order.

咱们换一个顺序来处理这些问题吧。

Let's be practical and work out the cost first.

咱们实际一点儿，先计算一下成本费用。

Let's attack one problem at a time.

咱们一次全力处理一个问题。