國小英語是很簡單的，因為對語法的要求很低，這個階段以聽課為主，只要將課堂上的知識掌握好就足夠了。下面是本站小編為大家整理的國小英語必背基礎知識，希望對大家有用!
1、 肯定句：是指用肯定的語氣來陳述的句子，如：
I’m a student. She is a doctor. He works in a hospital. There are four fans in our classroom. He will eat lunch at 12:00. I watched TV yesterday evening.
2、否定句：含有否定詞或表示否定意義詞的句子，如：I’m not a student. She is not (isn’t) a doctor.
He does not (doesn’t) work in a hospital. There are not (aren’t) four fans in our classroom.
He will not (won’t) eat lunch at 12:00. I did not (didn’t) watch TV yesterday evening.
☆注意 小結：否定句主要是在肯定句的基礎上加上了否定詞 ―not‖。有動詞be的句子則―not‖加在be後面，可縮寫成―isn’t，aren’t‖，但am not 一般都分開寫。沒有動詞be的句子則要先在主要動詞的前面加上一個助動詞(do，does，did)，然後在它後面加上―not‖，你也可以把它們縮寫在一起如―don’t , doesn’t , didn’t )。這三個助動詞要根據人稱和時態來選擇，其中―does‖只用於一般現在時主語是第三人稱單數的情況，而―did‖只用於一般過去時，不論主語是什麼人稱和數，都用―did‖ 。
3、一般疑問句：是指詢問事實的`句子，此類句子必須用―yes‖，或―no‖來回答。
如：Are you a student? Yes, I am / No, I’m not.
Is she a doctor? Yes, she is. / No, she isn’t.
Does he work in a hospital? Yes, he does. / No, he doesn’t.
4、特殊疑問句：以特殊疑問詞(what , where , who , which , when , whose , why , how等)開頭引導的句子。此類句子應該問什麼就答什麼，不能用
―yes 、no‖來回答。如：
What is this? It’s a computer.
What does he do? He’s a doctor.
國小英語知識總結動詞過去式詳解 動詞的過去式的構成規則有：
A、規則動詞
① 一般直接在動詞的後面加ed：如 worked , learned , cleaned ,
visited
② 以e結尾的動詞直接加d：如 lived , danced , used
③ 以子音字母加y結尾的動詞要改y為i再加ed(此類動詞較少)如
study – studied carry – carried worry – worried (注意play、stay不是子音字母加y,所以不屬於此類)
④ 雙寫最後一個字母(此類動詞較少)如 stopped
B、不規則動詞(此類詞並無規則，須熟記)國小階段要記住以下動詞的原形和過去式：
sing – sang , eat – ate , see – saw , have – had , do – did , go – went , take – took , buy – bought , get – got , read – read ,fly – flew , am/is – was , are – were , say – said , leave – left , swim – swam , tell – told , draw – drew , come – came , lose – lost , find – found , drink – drank , hurt – hurt , feel – felt
國小英語知識要點現在完成時主要用於：
1 、表示到現在為止這一時期中發生的動作或情況，即多次動作的總和。
e.g. We have learnt four English songs this month.
How many times have you read the novel?
For many days we haven`t seen each other.
2 、表示對現在有影響的某一已發生的動作。
e.g. The delegation has left 代表團已經走了(說明現在不在這裡) Look, what you have done. 看你乾的事。
與這一時態連用的時間狀語有：
already, yet, just, ever, never, by now, so far, recently, by the end of this month, since, for 短語，連詞 since 引導的時間狀語從句。 一般過去時與現在完成時的區別：
一般過去時：重在說明動作在過去發生時的具體情況(時間、地點、方式、物件、細節等)。
現在完成時：只提起已發生的動作(事實)及其影響，不說明動作發生時的具體情況。
cf. Have you had your lunch?
What did you have for lunch?
I have ever been to the Great Wall,_and_I went there last summer with my father.
注：現在完成時表達的動作常具有反覆性，故下面一句是錯的：
Have you seen the six thirty`s news program?
應改為：
