I can plant trees in spring.
一看这些英文单词,有两个动词,一个是can,一个是plant.
can是情态动词,plant是实意动词.主语是人I,谓语是trees,状语是介词词组in spring
所以按照语句的顺序可得一句英语：I can plant trees in spring.
而把它变成疑问句也可：Can I plant trees in spring?