frequently
She speaks French frequently.
他常常讲法语。
sometimes
Sometimes I drink tea.
我有时喝点儿茶。
Now and again
There were mainly foreigners living there, so we could chat with them now and again.
那里进进出出都是外国人, 我们可以时不时和他们搭讪聊天.
often，时常；常常；往往；大多
frequently，频繁地；经常
now and again时而；偶尔；有时
once in a while
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