Here are the mistakes in each sentence:

76. John sleeping in the car soundly.
- Mistake: "sleeping"
- Correction: "John is sleeping in the car soundly."

77. Ted and Baker always arrives late.
- Mistake: "arrives"
- Correction: "Ted and Baker always arrive late."

78. Megan speak softly to her mother.
- Mistake: "speak"
- Correction: "Megan speaks softly to her mother."

79. Jane and her children playing happily in the garden.
- Mistake: "playing"
- Correction: "Jane and her children are playing happily in the garden."

80. Are you always come early in the morning?
- Mistake: "come"
- Correction: "Do you always come early in the morning?"

81. Why do they always makes the room dirty?
- Mistake: "makes"
- Correction: "Why do they always make the room dirty?"

82. What are Rosa doing during the vacation?
- Mistake: "are"
- Correction: "What is Rosa doing during the vacation?"

83. I needs to boil some eggs.
- Mistake: "needs"
- Correction: "I need to boil some eggs."

84. My father are driving the car fast.
- Mistake: "are"
- Correction: "My father is driving the car fast."

85. This dress look gorgeous on you.
- Mistake: "look"
- Correction: "This dress looks gorgeous on you."

86. I always am at home at the weekend.
- Mistake: "always am"
- Correction: "I am always at home at the weekend."