1. What does the term "grammar" mean? What is a morpheme?

Group 3: Terminative and Durative Verbs

1. 
   Terminative verbs contain the idea that the action they express must come to an end, reaching some point where it has logically to stop.
   

This group includes such verbs as:

to stop to fall to begin to start to finish to open to close to shut to die to bring to come to find

e.g. When you close (terminative) the front door, don’t put (terminative) the key under the door mat.

2. 
   Durative verbs contain the idea that the action they express may go on indefinitely without reaching any logically necessary final point.
   

e.g. Do you speak English well?

2. 
   My parents are living and working in Brazil at the moment.
   
3. 
   3. The end of the action in durative verbs can be shown by an adverbial modifier of time, e.g. Jo will have read the book by Monday.
   
4. 
   4. Some English verbs can be either terminative or durative according to the context, in which they are used,
   

e.g. Hey! What makes it so long? Peter is still opening the door. Something is wrong with the key. (durative)