Một thấu kính phân kì có tiêu cự 20cm. Vật sáng AB đặt thẳng góc với trục chính và cách thấu kính một đoạn OA = d = 30cm. Xác định vị trí, tính chất của ảnh tạo bởi TKPK. Tóm tắt ........................................... ........................................... ........................................... ........................................... ........................................... ........................................... ........................................... . Bài giải: ................................................................................................ ................................................................................................ ................................................................................................ ................................................................................................ ................................................................................................ ................................................................................................ ................................................................................................

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Example: He/ She/ It (play) plays the guitar. 1) I (bake) …………………………….cakes. 2) You (work) …………………………….in an office. 3) We (take) …………………………….pictures of birds. 4) They (talk) …………………………….about cars. 5) He (think) …………………………….about school. 6) She (play) ……………………………. soccer. 7) It (rain) …………………………….here a lot. 8) I (like) …………………………….chocolate. 9) He (like) …………………………….chocolate. 10) You (watch) …………………………….movies. 11) She (watch) …………………………….movies. 12) The babies (cry) ……………………………. every night. 13) The baby (cry) …………………………….every night. 14) I (fly) …………………………….to Belize every year. 15) My father (fly) …………………………….to Belize every year. Exercise 9: Fill in the spaces with the correct form of the verb in simple present tense. Example: I (play) play the guitar. Example: Jessica (play) plays the guitar. 1) I (be) ____________________ sixteen years old. 2) Tommy (live) ___________________ at 107 Pine Lane. 3) Juana (cook) ______________________ dinner for her family. 4) They (eat) ________________________ lunch at 12:00. 5) Nina (take) ________________________ medicine when she is sick. 6) I (like) _________________________ chocolate. 7) He (drive) _______________________ a nice car. 8) We (want) _____________________ to see a movie tonight. 9) Mr. Anderson (teach) _____________________ chemistry at Hill High School. 10) They (study) ______________________ English at school. 11) I (want) ______________________ to go home now.