文法4 - 不定詞 片語

不定詞為助動詞的變化，帶有不確定語氣

不定詞片語 = to + 原形動詞

不定詞與助動詞有什麼共同點?

一:後面都要接原形動詞
ex. I will go.
      I want to go.

二:都有"不確定"的語氣
ex. He may be right.
      He seems to right.

三:都要用完成式來表達相對的過去時間 -->  猜測過去(文法9:語氣助動詞)
ex. It must rain last night (X)
      It must have rained last night. (O)
      It seems to have rained last night. (O)

四:所有重要的語氣助動詞，都可以對照為不定詞。

must = have to

should = ought to

will/would = be going to

can/could = be able to

may/might = be likely to 

動狀詞(Verbals)的分類:

現在分詞 -> 形容詞
過去分詞 -> 形容詞
動名詞 -> 名詞 (確定語氣,已經做過了,現在發生,持續性)
不定詞 -> 不一定是什麼詞 (名詞,形容詞,副詞) (不確定語氣,未來發生)

plan + to
avoid + 動名詞
hate + to
like + to
dislike + 動名詞
try + to (未來)
try + 動名詞 (現在)
remember + to
remember + Ving
Stop + Ving + to