The use of a/an and there is/there are

The use of a/an and there is/there are

We use "a" when in the next word the first letter have consonant sound, and we use "an" when the next words starts with a letter with vocal sound.

Examples:

•     a    house
•     an  elephant
•     an  orange
•     an  appointment
•     a    present

There is/there are

We use "there is" when we speak about singular and we use "there are" when we speak about plural.

Examples: 

• There is a house/There are 2 houses
• There is an elephant/There are 2 elephants

In negative forms will be like this:

• There isn´t a house/There aren´t 2 houses
• There isn´t an elephant/There aren´t 2 elephants

In question forms:

• Is there a house?                              Yes, there is                          No, there isn´t
• Are there 2 houses?                         Yes, there are                        No, there aren´t

• Is there an elephant?                        Yes, there is                           No, there isn´t
• Are there 2 elephants?                     Yes, there are                         No, there aren´t