In case+子句 / lest +原型動詞 (以免)

I took an earlier train to avoid being late.
She lowered her voice so as not to wake the baby. 
He left quietly, in case he disturbed the others.

lest” 後面通常接動詞原形(base form),因為它包含了一種虛擬語氣的用法,表達避免某事發生的目的。Lest 是一個稍顯正式或書面的詞,在日常口語中不如 so as not to 或 in case 常用。
She spoke softly, lest she reveal the secret.

I get up early so as to stay healthy. (so as to = in order to)

這個網誌中的熱門文章

Take/Make a Note/ Notes / (the note for)

even though (儘管) vs even if (即使)