英文文法(when用法)

When 可以有以下的用途:
1. if (假如/當) 的意思:
如果是這個用途, when 都可以以 'whenever/everytime (that)'取代啊!
e.g. when you heat ice, it turns to water
(當你熱冰, 它會變成水)

tense 一般都是 'when verb(present tense), verb(present tense)'

2. as / while (表示時間的):

a. 一句有2actions, 較短的就是when後面個個了~
tense : 'when verb (past tense), was were verb (ing from)'
e.g. mary was having dinner when the phone rang
(在mary食dinner昤, 個電話響.)

b. 2action 是immediatly發生的/接著出現的
tense: 'when (past), (past)'
e.g. i kewn there had been an accident when the polic came

c. 要講在過去的一個時間發生的事
tense: 'when (past), (past)'
e.g. my mother call me BB when i was a baby.

3. 何時 (題問時用的):
e.g. when did you set off for your trip last week?
(上星期你何時出發去旅行?)
then 個個人可能告知你他出發的日期

e.g. when did you go to swimming yesterday?
(你昨日何時去遊水?)
then 個個人可能告知你他遊水的時間, 2.00p.m.etc.


其實有時d用途好似好similar咁...要慢慢理解啊!

When do you go to school everyday? = present tense question
When did you go to school yesterday ? = past tense question
When will you go to school on Friday? = future tense question

When I am on holiday, I will visit my grandparents.
When I am going to school, I meet Mrs Lee. = present continuous tense
When I was young, I used to go to my grandparents home once a week. = past tense.

When it rains, we will cancel the picnic = has the meaning of IF)
Please change it when it is possible. = present tense (when has the meaning of IF)

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