I can use prepositions of time and adverbs of frequency correctly.

我能正确使用时间介词和频率副词。

Where do we usually put adverbs of frequency ?

频度副词我们通常放在哪里？。

Adverbs of frequency tell you how often things happen.

副词 告诉你事情每隔多久发生一次。

Adverbs of frequency are placed after the verb 'to be' when used as the main verb of the sentence.

当be动词作为一个句子的主要动词时，频率副词位于be动词之后。

Some adverbs of frequency (sometimes, usually, normally) are also placed at the beginning of the sentence for emphasis.

一些频率副词（有时、经常、通常）也会位于句首，以进行强调。