Complete the sentences. Use the present continuous form verbs from exercise 2.4.1.4.21. My best friend next to me.2. I ready for the party.3. Mum a cake.4. We my brother's computer.5. Lucy her homework. ​

1. My best friend is sitting next to me.
Explanation: The verb "to be" (is) is used to describe the location or position of someone or something. In this case, the present continuous form "is sitting" is used to indicate that my best friend is currently sitting next to me.

2. I am ready for the party.
Explanation: The verb "to be" (am) is used to describe the state or condition of someone. In this case, the present continuous form "am ready" is used to indicate that I am currently prepared or in a state of readiness for the party.

3. Mum is baking a cake.
Explanation: The verb "to be" (is) is used to describe an ongoing action or activity. In this case, the present continuous form "is baking" is used to indicate that Mum is currently in the process of baking a cake.

4. We are using my brother's computer.
Explanation: The verb "to be" (are) is used to describe an ongoing action or activity. In this case, the present continuous form "are using" is used to indicate that we are currently using my brother's computer.

5. Lucy is doing her homework.
Explanation: The verb "to be" (is) is used to describe an ongoing action or activity. In this case, the present continuous form "is doing" is used to indicate that Lucy is currently engaged in doing her homework.