Add -ing to the verb:

do

(a)  

Add -ing to the verb:

sleep

(a)  

Add -ing to the verb:

sit

(a)  

Add -ing to the verb:

dance

(a)  

Add -ing to the verb:

read

(a)  

Add -ing to the verb:

swim

(a)  

Add -ing to the verb:

make

(a)  

Add -ing to the verb:

go

(a)  

Add -ing to the verb:

come

(a)  

Add -ing to the verb:

watch TV

(a)