教育新聞網(wǎng)once a week是頻率副詞,表示的是一種不斷重復(fù)的行為頻度,往往放在句子中間，實(shí)義動(dòng)詞之前，非實(shí)義動(dòng)詞之后，在否定句中，有的頻度副詞位于否定詞之前或之后均可，而有的頻度副詞則必須位于否定詞之后，還有的頻度副詞卻必須要位于否定詞之前。
頻率副詞等級(jí)
all the time 100%；
almost，always 90%；
generally，usually 80%；
often，frequently 60-70%；
as often as not 40-50%；
sometimes，at times 20-30%；
occasionally，from time to time 10%；
hardly，seldom，rarely 5%；
never 0%。
3、頻率副詞用在be動(dòng)詞后
He was always late.他以前經(jīng)常遲到。
4、頻率副詞用在實(shí)意動(dòng)詞前
My father usually walks home.我的父親經(jīng)常步行回家。
once a week造句1、How many skateboard classes once a week?
2、Occurring, appearing, or done once a week or every week.
3、Go once a week if you can.
4、Lung cells were replaced once a week.
5、She does the aerobics once a week.
6、What you should do: Run Yasso 800s once a week.
7、We used go to the movies about once a week.
8、Hence clean the ears once a week with cotton buds.
9、They also check for diseases or pests once a week.
10、Proofread the English Ad once a week by Email.
來(lái)源：高三網(wǎng)
能發(fā)現(xiàn)自己知識(shí)上的薄弱環(huán)節(jié)，在上課前補(bǔ)上這部分的知識(shí)，不使它成為聽(tīng)課時(shí)的“絆腳石”。這樣，就會(huì)順利理解新知識(shí)，相信通過(guò)once a week是頻率副詞嗎這篇文章能幫到你，在和好朋友分享的時(shí)候，也歡迎感興趣小伙伴們一起來(lái)探討。
