Answer:
The sentences in the present continuous are:
a) Jane is riding a bike this weekend.
b) I am jumping in the party right now.
c) My friend is doing the school's work tonight.
d) My mother is making a cake this weekend.
e) My friends and I are riding our bikes this weekend. We are enjoying it very much.
f) George is wearing long hair.
g) I am bringing a snack to school today.
h) I am sleeping until late tomorrow.
i) I am thinking of going to London next year.
j) I am playing computer games in my bedroom.
Step-by-step explanation:
The present continuous structure is the following:
subject + am/is/are + main verb with -ing
We need to pay attention to the use of the present continuous as well before we can transform the sentences. The present continuous is used to refer to actions that are taking place at the moment of speaking or that are to happen in a nearby future. Notice that the present continuous cannot be used for habitual actions - that is for the simple present. That is why, in the sentences above, more changes were necessary. Instead of "all the weekends," which refers to a habitual action, for instance, we can use "this weekend".
NOTE: For letter F, I needed to change the verb. In English, "George is having long hair" is not an acceptable structure.