Một quả cầu nhỏ nhẹ đang trung hòa về điện. Đưa 1 bản cực âm lại gần quả cầu. Có hiện tượng gì xảy ra với quả cầu (hiện tượng ban đầu và hiện tượng cuối cùng) . Biết quả cầu được treo bởi một sợi chỉ tơ.

1) Đưa vật A đã nhiễm điện lại gần vật B thấy hai vật hút nhau . Em có nhận xét gì về vật B.

2) Một quả cầu nhỏ nhẹ đang trung hoà về điện. Đưa một bản cực âm lại gần quả cầu . Có hiện tượng gì xảy ra với quả cầu ( hiện tượng ban đầu và hiện tượng cuối cùng ) . Biết quả cầu được treo bởi một sợi chỉ tơ.

CHIA ĐỘNG TỪ:

1, MY BICYCLE ISN'T HERE ANY MORE. Some body (take) it.

2, I wish my friend (be) here now.

3, She wishes she (can) do the exercise.

4, She said he (will) come soon.

5, He suggested (go) out for a meal.

6, if you work hard, you (get) good grades.

7, They suggested that we (go) for a picnic.

8, He is pleased that you (help) him.

9, You (meet) her if you come here soon.

10, Mr.Brown (not go) to work by car yesterday.

11, Up to now, I (visit) 20 countries.

12, - You (see) him last night?

-No. I (not see) him for a long time.

13, They (go) to Nha Trang for their holidays next week.

14, My sister and I often (go) swimming when we(be) children.

15, I (watch) TV fist and then I (do) exercises.

16, They (not play) soccer at 2p.m.

17, She said she (come) and see me.

18, I often (climb) trees when I was young.

19, lan (not have) a picnic with her friends last week.

20, Tomorrow (be) Sunday. My family (visit) our grandmother in the countryside

CHIA ĐỘNG TỪ:

1, MY BICYCLE ISN'T HERE ANY MORE. Some body (take) it.

2, I wish my friend (be) here now.

3, She wishes she (can) do the exercise.

4, She said he (will) come soon.

5, He suggested (go) out for a meal.

6, if you work hard, you (get) good grades.

7, They suggested that we (go) for a picnic.

8, He is pleased that you (help) him.

9, You (meet) her if you come here soon.

10, Mr.Brown (not go) to work by car yesterday.

11, Up to now, I (visit) 20 countries.

12, - You (see) him last night?

-No. I (not see) him for a long time.

13, They (go) to Nha Trang for their holidays next week.

14, My sister and I often (go) swimming when we(be) children.

15, I (watch) TV fist and then I (do) exercises.

16, They (not play) soccer at 2p.m.

17, She said she (come) and see me.

18, I often (climb) trees when I was young.

19, lan (not have) a picnic with her friends last week.

20, Tomorrow (be) Sunday. My family (visit) our grandmother in the countryside.

CHIA ĐỘNG TỪ:

1,We (know) that Columbus (discover) America nearly 500 years ago.

2, AFTER (LEAVE) SCHOOL, jOHN (FIND) IT VERY DIFFICUL TO GET A JOB.

3, Stop (argue) and start (work).

4, Mozart (start) (compose) at the age of five and (write) more than 600 pieces of music.

5, I (be) in Moscow in some month.

6, Father Christmas (bring) presents to good children every years.

7, Ba (learn) Chinese at school, but he (forget) most of it.

8, It (get) hotter and hotter in June.

10, We (finish) our homework three hours ago.

11, My father ang my elder brother (play) tennis at present.

12, Water (boil) at 100 degree centigrade.

13, I (lose) my pen. I can't find it any where.

14, I wish I (live) in a big house.