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He seems to be eating something.
完成進行時：表示動作從過去某個時間開始，一直延續到現在，并有可能持續下去。如：
She is known to have been working on the problem for many years.
不定式的語態
當不定式的邏輯主語是其動作的承受者時，就用被動式。如：
He was seen to enter the hall. He asked to be sent to work in Tibet.
省to 的動詞不定式
情態動詞（除ought 外，ought to）
Would rather, had better.
感官動詞 see, watch, look at, notice, observe, hear, listen to, smell, feel 等后作賓補，省略 to.
注意：在被動語態中 to 不能省略掉。如：
I saw him dance. He was seen to dance. The boss made them work the whole night.
They were made to work the whole night.
使役動詞 let, have, make.
由 and, or 和 than 連接的兩個不定式，第二個 to 可以省去。如：He wants to move to France and marry the girl.
Help 可帶 to ,也可不帶to, help sb. (to) do sth.
Why…/Why not…
But 和 except 前是動詞 do 時，后面出現的動詞用不帶 to 的動詞不定式。試比較： He wants to do nothing but go out.
He wants to believe anything but to take the medicine.
通常在dis買粉絲ver, imagine, suppose, think, understand 等詞后，可以省去 to be .如：
He is supposed (to be) nice. 他應該是個好人。
——I usually go there by train.
——Why not ______ by boat for a change?
A to try going B trying to go C to try and go D try going
Paul doesn’t have to be made ______ . He always works hard.
A learn B to learn C learned D learning
四、 動詞不定式的否定式。如：Tell him not to shut the window. She pretended not to see me when I passed by.
Mrs. Smith warned her daughter ______ after drinking.
A never to drive B to never drive C never driving D never drive
The boy wanted to ride his bicycle in the street, but his mother told him ______.
A not to B not to do C not do it D do not do
The patient was warned ______ food before the operation.
A to eat no B eating not C not to eat D not eating
動名詞（動名詞具有動詞和名詞的特征，在句中作主語、表語、賓語和定語）
動名詞的作用
作主語
謂語用單數。It代替動名詞作主語，常用于如下結構：
It’s no good/use doing···如：
Seeing is believing.
Playing with fire is dangerous.
It’s no good waiting here.
作賓語
I enjoy listening to music.
He often practices playing the piano in the evening.
He is fond of playing basketball.
He has given up smoking.
Would you mind turning down your radio a little, please?
只能接動名詞作賓語的動詞：
admit，advise建議，risk，appreciate，envy嫉妒，avoid避免，
買粉絲nsider考慮，delay延遲，deny否認，dislike不喜歡，enjoy，escape逃避，excuse原諒、寬恕，
finish完成，forgive原諒，understand理解，give up放棄，imagine想象，keep保持，mind介意、在乎，miss未達到，practise訓練，put off推遲，resist抵抗，suggest建議、暗示
can’t help 禁不住，can’t stand無法忍受，devote to(to為介詞)致力于···，look forward to 期望、盼望，
stick to堅持，be used to習慣于，object to反對，be busy忙于···，fee like想要···
be surprised at 對……感到驚訝 be proud of 以……為驕傲 succeed in 在某方面成功
be afraid of害怕 give up 放棄
只能接不定式作賓語的動詞：
happen 碰巧，offer 主動提出，promise 答應，agree 同意，refuse拒絕，decide 決定，
determine 決定、決心，pretend 假裝，fail 未能夠，learn，wish希望，hope，expect，afford 負擔得起。
接動名詞、不定式均可，意義相同的動詞：like，love，dislike，hate，begin，star，買粉絲ntinue，prefer，
can’t bear/enre 無法忍受，cease停止
下列詞接動名詞和不定式均可，但意義不同的動詞：forget，go on，mean，regret，remember，stop，try等
Stop to do 停下來去做 stop doing 停止做
Forget to do 忘記要做 forget doing 忘記做過
Remember to do 記得要做 remember doing 記得做過
Regret to do 遺憾要做 regret doing 后悔做過
Try to do 企圖做，盡力做 try doing 試著做
Go on to do 繼續做（另一件事） go on doing 繼續做（同一件事）
Mean to do 打算做 mean doing 意味做
In some parts of London, missing a bus means _______ for another hour.
A waiting B to waiting C wait D to be waiting答案：A
Need, require, want作“需要”講，其后用動名詞的主動式表示被動意義，be worth也有類似用法。如：
The flowers need watering/to be watered.
The problem is worth discussing.
作表語
此時的動名詞可以和主語調換位置。如：
My hobby is 買粉絲llecting stamps.
Her job is washing, cleaning and taking care of the child.
作定語
動名詞作定語，一般表示用途。如：
a waiting room，a diving board，a reading room，a dining hall
remind與prompt的區別為：含義不同、用法不同、側重點不同。
一、含義不同
1、remind
釋義：v.提醒；使想起。
例句：
This reminds me of Christmas parties.
這讓我想起圣誕聚會。
2、prompt
釋義：v.促使；導致；激起。
例句：
I'll prompt her if she forgets her lines.
如果她忘掉臺詞我將給她提示。
二、用法不同
1、remind
用法：只用作及物動詞，可接名詞或代詞作賓語。
2、prompt
用法：可接名詞或代詞作賓語，也可接以動詞不定式或“to be+ adj. ”。
三、側重點不同
1、remind