2. he : subject

is : to be

doing : V-ing

a science project : object

right now : adv of time

3. she : subject

is not : to be not

writing : V-ing

a letter : object

4. alin : subject

is not : to be not

going : V-ing

Melbourne : object

5. is : to be

alin : subject

going : V-ing

japan : object

6. is : to be

cat : subject

playing : V-ing

dog : object

7. i: subject

am : to be

working : V-ing

computer : object

now : adv of time

8. i : subject

am : to be

having : V-ing

friend: object

Saturday: adv of time

9. i : subject

am : to be

always : adv of time

losing : V-ing

bag : object

10. we : subject

are : to be

building : V-ing

dream house : object

next year : adv of time

present continuous:

(+) S + to be(is,am,are) + V-ing + O + adv

(-) S + to be(is,am,are) + not + V-ing + O + adv

(?) to be(is,am,are) + S + V-ing + O + adv?....

aturan penggunaan to be:

is untuk subject he,she,it.

am untuk subject i

are untuk subject they,we,you.

present continuous menjabarkan kegiatan yang sedang berlangsung saat ini.