PRESENT SIMPLE VS PRESENT CONTINUOUS

• Do he usually work in the lab's school?

• Does he usually work in the lab's school?

• Is he work usuallly in the lab's school?

• Is he working usually in the lab's school?

• Look! The solution is boiling in the flask

• Look! The solution boiling in the flask

• Look! The solution boils in the flask

• Look! The solution boil in the flask

• Shhhh! The chemist explain the practice

• Shhhh! The chemist explains the practice

• Shhhh! The chemist explaining the practice

• Shhhh! The chemist is explaining the practice

• Macromolecules often has unusual physical properties that do not occur for smaller molecules.

• Macromolecules often have unusual physical properties that do not occur for smaller molecules.

• Macromolecules often having unusual physical properties that do not occur for smaller molecules.

• Macromolecules are often having unusual physical properties that do not occur for smaller molecules.

• The triglycerides serves as an energy storage depot

• The triglycerides serve as an energy storage depot

• The triglycerides are serving as an energy storage depot

• The triglycerides serving as energy storage depot

• Do carbohydrates provide the body with glucose?

• Does carbohydrates provides the body with glucose?

• Is carbohydrates providing the body with glucose?

• Are carbohydrates providing the body with glucose?

• Do you know the lipids' classification?

• Does you know the lipids' classification?

• Are you knowing the lipids' classification?

• Is you knowing the lipids' classification?

• She study Biochemistry right now

• She studies Biochemistry right now

• She studying Biochemistry right now

• She's studying Biochemistry right now

• We has biochemistry class twice a week

• We have biochemistry class twice a week

• We are having biochemistry class twice a week

• We having biochemistry class twice a week

• Hydrogen bonding gives the ice a linear structure

• Hydrogen bonding give the ice a linear structure

• Hydrogen bonding is giving the ice a linear structure

• Hydrogen bonding are giving the ice a linear structure