past progressive

1. Structure

1.1. Affirmative

1.1.1. S+Verb to be+ (verb+inf)+C

1.2. Negative

1.2.1. S+Verb to be+not+ (verb+ing)+C

1.3. Interrogative

1.3.1. Verb to be+S+ (verb+ing)+C+?

2. Time clauses

2.1. To discribe an angoing action

2.1.1. While , when

2.1.2. While Marcedes was smiling her boyfriend kissed her.

3. Functions

3.1. Describe actions in the past.

3.1.1. I was eating my dog barked.

3.2. To discribe an activity or event in progress over a period of time in yhe past.

3.2.1. What was happening during the part.

3.3. To discribe background activities.

3.3.1. David was developing a cure for cancer.