The document discusses the present continuous tense, which is used to talk about actions happening at the time of speaking. It provides examples of the positive sentence structure as subject + to be + verb + ing + subject, the negative as subject + to be not + verb + ing + subject, and the question as to be + subject + verb + ing + object?.

1. Present
continuous
tense

2. We use present
continuous to talk
about action
happining at the time
of speking

3. Possitive sentnce:
S + to be + verb(ing) +
subj.

4. Negative sentence:
S + tobe(not) +
verb(ing) + subj.

5. Question sentence:
To be + S + verb (ing)
+ obj?