ko khí đó

k nha!

Hòa tan hoàn toàn 7,84 gam bột bằng dung dịch chứa hỗn hợp gồm HNO₃ và NaHSO₄ thu được dung dịch X chỉ chứa m gam muối trung hòa và 2,464 lít (đktc) hỗn hợp khí Y gồm khí H₂ và N₂O. Cho dung dịch X tác dụng với lượng dư dung dịch KMnO₄/H₂SO₄ thì thấy có 2,528 gam KMnO₄ bị khử. Biết khí N₂O là sản phản khử duy nhất của N⁺⁵. Giá trị m là:

A. 48,3

B. 49,1

C. 50,4

D. 51,8

1. In 1990 / we / move / to another city

=>In 1990, we moved to another city.|In 1990 we moved to another city.

2. When / you / get / the first gift ?
=>When did you get the first gift?

3. She / not / go / to the church / five days ago
=>She did not go to the church five days ago.|She didn’t go to the church five days ago.

4. How / be / he / yesterday ?
=>How was he yesterday?

5. Mr. and Mrs. James / come back home / and / have / luch / late / last night ?
=>Did Mr. and Mrs. James come back home and have lunch late last night?

6. She / not go / park / friend / last Friday
=>She didn't go to the park with her friend last Friday.

1. They came back home after they had finished their work

2. She said that she had met Mr. Been before

3. Before he went to bed, he had read a novel.

4. He told me he hadn't worn such kind of clothes before

5. When I came to the stadium, the match had started

6. Before she listened to music, she had done homework.

7. Last night, peter had gone to the supermarket before he went home

1. hear/ how/ Vietnam/ Tim/ about/ in/ live/ students/ like.
....Tim likes hearing about how students live in Vietnam
2. show/ to/ post office/ can/ me/ the/ you/ the way/ nearest?
....Can you show me the way to the nearest post office ?
3. me/ last/ uncle/ the One Pillar Pagoda/ take/ see/ Sunday/ my/ to.
....My uncle took me to see the one pillar Pagoda last sunday
4. buy/ stamps/ mail/ Hanh/ some/ overseas/ need/ for/ to.
....Hanh needs to buy some stamps for the overseas mail

Bạn có thể bỏ "by them" nha!! tick nhé

Change the sentences from active to passive :

Should they have Jane with the sewing ?

=>Should Jane be helped with the sewing by them ?

Did they feed LuLu last night ?

=>Was LuLu fed last night by them ?

Has anyone ever aked you for your opinion ?

=>Have you ever been asked for your opinion ?

Where will your company send you next year ?

=>Where will you be sent by your company next year ?

Lưu ý ở phần “by sb” chú ý :
Nếu chủ ngữ là các đại từ nhân xưng với các danh từ chỉ chung như(people,.)các đại từ bất định (somebody,anything,..) thì ta được bỏ “by sb” đi ngược lại khi chủ ngữ là chủ ngữ riêng danh từ cụ thể thì bắt buộc phải dùng “by sb”