12) I usually wash up and my brother Bill the dishes. (dry) 13) I'm afraid my grandma is ill. She in bed all day. (lie)

12) I usually wash up and my brother Bill dries the dishes.

In this sentence, the verb "wash up" is used to refer to the action of cleaning dishes, while the verb "dry" is used to refer to the action of removing water from the dishes after they have been washed. So, the correct form of the verb "dry" is used in the sentence.

To solve this, you need to conjugate the verb "dry" in the appropriate tense and form. In this case, it is the simple present tense, indicating a habitual action. The base form of the verb "dry" is "dry". When the subject is the third person singular (he, she, it), you need to add an "s" to the base form of the verb. Therefore, "dries" is the correct form of the verb "dry" to be used in this sentence.

Example:
I usually wash up and my brother Bill dries the dishes. - Я обычно мою посуду, а мой брат Билл вытирает ее.

13) I'm afraid my grandma is ill. She is lying in bed all day.

In this sentence, the verb "lie" is used to describe the action of being in a horizontal position, usually on a bed or some other surface. So, the correct form of the verb "lie" is used in the sentence.

To solve this, you need to conjugate the verb "lie" in the appropriate tense and form. In this case, it is the present continuous tense, indicating an action happening at the moment of speaking. The base form of the verb "lie" is "lie". When the subject is the third person singular, you need to add "s" to the base form of the verb. However, in the present continuous tense, instead of adding "s", you add "is" for the third person singular. Therefore, "is lying" is the correct form of the verb "lie" to be used in this sentence.

Example:
I'm afraid my grandma is ill. She is lying in bed all day. - Боюсь, что моя бабушка болеет. Она целый день лежит в кровати.