sifting

She is sifting the flour into a large bowl before making the cake.

用法提示：sifting 是动词 sift 的现在分词，与 is 构成现在进行时，表示正在过筛面粉。

The children are sifting the sand to look for pretty shells.

用法提示：sifting 与 are 构成现在进行时，表示用筛子分离沙子的动作。

After sifting the soil, the gardener planted the seeds in neat rows.

用法提示：sifting 是动名词，用在介词 After 后，表示完成过筛土壤的动作。