1. since vs. for
Both "since" and "for" are used in relation to time, the difference is that the former is used with a point in time, such as Monday, January, and 2009, while the latter is used with time periods, such as 30 minutes, 6 months, and 10 years, "for" can be used in all tenses, while "since" is usually used in the perfect tense. “He jogs for 1 hour everyday。 The "for" in this sentence is followed by a period of time, "He's been jogging since 7am." In this sentence, the word "since" is followed by a point in time.
2. fewer vs. less
“fewer”和“less”适用的名词类型是完全相反的，“fewer”适用于可数名词，比如books、cars、people或者cups，而“less”则适用于不可数名词，比如love、water、electricity或者information。 举个例子，你可以说“This parking lot is too crowded. I wish there were fewer cars。 ”，句子里的car是可数名词，所以前面用“fewer”修饰；你也可以说“I wish you would turn off the lights, so we could use less electricity。 ”，这里的electricity是不可数名词，所以用“less”来修饰。
3. Adjective Order
When you use more than one adjective, keep in mind that the adjectives are arranged in a certain order, "It's a red big car." Such an expression is wrong, and the correct expression should be "It's a big red car." ”。
Usually the adjectives are arranged in this order: (1) quantity or number (2) quality or evaluation (3) size (4) shape (5) age (6) color (7) nationality (8) material. Of course, generally speaking, you don't use more than three adjectives to describe a thing, so you rarely come across situations where you need to use all of the above in order.
A pretty little square old black Japanese wooden writing desk.
An old, very beautiful black Japanese-style square wooden desk.
4. may vs. might
“may”和“might”的区别很小，都表示“可能”，所以很难把握准确使用它们的时机。 但是二者还是有区别的，“might”的可能性比“may”更小。 “I might take a trip to India next year。 ”的意思是明年你有可能去印度，也有可能不去，而“I may have a slice of cake after dinner。 ”则是表示你会在饭后吃蛋糕的可能性相当高。
除此之外，“might”还是“may”的过去式，所以在现在时态你可以说“He may eat the last piece of cake。 ”，但是过去时态你就要说“He might have eaten the last piece of cake。 ”。
5. bring vs. take
"bring" and "take" both mean "bring", but in different directions, and the relationship between the two is somewhat similar to "come" and "go", "bring" means "bring", which can be used in situations where you need someone to bring something to your location, such as "Bring that book here." "take" means "to take away" and can be used when you want to bring something to your destination, such as "Please take me home." ”。
6. me vs. myself
不管是以英语为母语的人，还是英语学习者，都会混淆“me”和“myself”。 许多母语不是英语的人会在应该使用“me”的时候用“myself”，因为他们认为“myself”比“me”更有礼貌，其实这是错误的。 “me”是人称代词宾格，是动作实施对象，例如“Please call me if you have any questions。 ”；“ myself”是反身代词，用在自己要对自己实施某动作的时候，例如“I gave myself a break from studying today。 ”。
7. could, should, or would
These three words with similar pronunciations have bothered many English learners.
“should”用来提供建议，比如“That shirt looks great on you. I think you should buy it。 ”。
“would”则是用来描述不可能或者虚拟的事情，比如“I would love to go to Italy, but I don't have enough money。 ”，这句话就是在说一件不可能发生的事。 而“would”也可以表示委婉语气，就像这句“Would you like some tea?”
“could”有三种用法：
①描述过去的能力，例：“When I was younger, I could run twice as fast。 ”
②描述将来可能发生的事，例：“If we work really hard, I think we could save up enough money for a vacation this year。 ”
③用于礼貌请求，例：“Could I have a cup of tea?”
8. there, their, or they're
These three words have the same pronunciation but are used in completely different ways.
“There”可以表示“那里”，表示一个指定地方，例如“The book is over there on the table。 ”；“ there”也可以和be动词一起使用构成“there+be"句型，例如“There are 5 cafes on this street。 ”。
“Their”是形容词性物主代词，意为“他(它)们的”，例如“That's their house。 ”。
“They're”是“they are”的缩写，用法也是一样，你可以说“They're going to play soccer with us tonight。 ”，也可以说“They are going to play soccer with us tonight。 ”，意思完全一样。
9. its vs. it's
和上一条一样，这两个词读音相同，用法完全不同。 “it's”是“it is”的缩写，用法也是相同，你可以说“It's really cold outside today。 ”，也可以说“It is really cold outside today。 ”，意思完全相同。 “its”则是“it”的物主代词形式，意为“它的”，例如“This city is known for its amazing pasta。 ”。
10. a vs. the
Definite and indefinite articles are not used in many languages, making it a difficult concept for some English learners to distinguish. When you're talking about something, it's common to use the indefinite article "a", such as "Let's watch a movie." If you're talking about something that's familiar to everyone, you can use the definite article "the," such as "Let's watch the movie." The "movie" in this sentence means a movie that both sides of the conversation know and are talking about.