在此期间，英语对非本族语者提出了一系列问题，如动词时态，不规则动词，书写系统，语法等等。

At the meantime, English presents a number of issues to non-native speakers, such as verb tenses, irregular verbs, writing system, syntax and so on.

youdao

若按普通英语的动词时态规则，就得用一般过去时或现在完成时。

In this case, the past or present perfect tense should be used according to the grammatical rules of common English.

youdao

过去时态的句子以及动词过去式规则与不规则变化。

Simple past statements with regular and irregular verbs.

youdao