Mr Smith is usually at work in the daytime.这里usually 是什么词?

Mr Smith is usually at work in the daytime.这里usually 是什么词?
Mr Smith is usually at work in the daytime.
这里usually 是什么词?

Mr Smith is usually at work in the daytime.这里usually 是什么词?
分析,副词,很明显,
要是想不通,这个词本身就是副词

usually ,通常,它是一个表示频率的副词