to prepare my lessons 是不定式短語,做目的狀語.
I often spend as much time as I can 是一個整體“我時常花費(fèi)盡可能多的時間”；
to prepare my lessons 去“準(zhǔn)備我的功課”,表示目的.這個我知道，但是as much time as I can 是插入語不是可以忽略不看嗎，然后不就變成spend doing sth了嗎？此句不是這樣的。I often spend as much time as I can 主語是I，謂語是spend，賓語是time，as much as Ican 是修飾time的做定語。spend 可以用于花“錢”和花“時間”，其慣常用法有：(1) spend some time ding sth. (2) spend something on (sth. or) ding sth. (3) spend some time to do sth.給予部分例句：特別注意（3）（1）How much money do you spend each week?你每星期花多少錢？（2）I spent an hour reading.我花了一小時讀書。（3）Now more and more city adults spend their leisure time to improve themselves at school or college. 現(xiàn)在城市里越來越多的成年人利用業(yè)余時間到學(xué)?；虼髮W(xué)去深造。（與你的句子相似）（4）Will you be spending your holidays abraod this year? 你今年準(zhǔn)備到國外去度假嗎?