Modal Verb

Modal  Verb  เป็น verb  ช่วยซึ่งสามารถนำมาใช้ได้หลายอย่างดังนี้

Modal	Example	Uses
Can	They can control their own budgets. We can’t fix it. Can I smoke here? Can you help me?	Ability / Possibility Inability / Impossibility Asking for permission Request
Could	Could I borrow your dictionary? Could you say it again more slowly? We could try to fix it ourselves. I think we could have another Gulf War. He gave up his old job so he could work for us.	Asking for permission. Request Suggestion Future possibility Ability in the past
May	May I have another cup of coffee? China may become a major economic power.	Asking for permission Future possibility
Might	We'd better phone tomorrow, they might be eating their dinner now. They might give us a 10% discount.	Present possibility Future possibility
Must	We must say good-bye now. They mustn’t disrupt the work more than necessary.	Necessity / Obligation Prohibition
Ought to	We ought to employ a professional writer.	Saying what’s right or correct
Shall (More common in the UK than the US)	Shall I help you with your luggage? Shall we say 2.30 then? Shall I do that or will you?	Offer Suggestion Asking what to do
Should	We should sort out this problem at once. I think we should check everything again. Profits should increase next year.	Saying what’s right or correct Recommending action Uncertain prediction
Will	I can’t see any taxis so I’ll walk. I'll do that for you if you like. I’ll get back to you first thing on Monday. Profits will increase next year.	Instant decisions Offer Promise Certain prediction
Would	Would you mind if I brought a colleague with me? Would you pass the salt please? Would you mind waiting a moment? "Would three o`clock suit you?" - "That’d be fine." Would you like to play golf this Friday? "Would you prefer tea or coffee?" - "I’d like tea please."	Asking for permission Request Request Making arrangements Invitation Preferences

Prefix

เป้น  prefix(เติมข้างหน้า)คะ

Common Prefixes

Prefix	Meaning	Example
a-, an-	without	amoral
ante-	before	antecedent
anti-	against	anticlimax
auto-	self	autopilot
circum-	around	circumvent
co-	with	copilot
com-, con-	with	companion, contact
contra-	against	contradict
de-	off, away from	devalue
dis-	not	disappear
en-	put into	enclose
ex-	out of, former	extract, ex-president
extra-	beyond, more than	extracurricular
hetero-	different	heterosexual
homo-	same	homonym
hyper-	over, more	hyperactive
il-, im-, in-, ir-	not, without	illegal, immoral, inconsiderate, irresponsible
in-	into	insert
inter-	between	intersect
intra-	between	intravenous
macro-	large	macroeconomics
micro-	small	microscope
mono-	one	monocle
non-	not, without	nonentity
omni-	all, every	omniscient
post-	after	postmortem
pre-, pro-	before, forward	precede, project
sub-	under	submarine
syn-	same time	synchronize
trans-	across	transmit
tri-	three	tricycle
un-	not	unfinished
uni-	one	unicorn

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