Explanations

III

  1. Yes. Are going is a verb group.
  2. No. The verb here is 'is' which has been contracted. What's = what is ...
  3. No. Won't (will not) go is the verb group. Work in this sentence is a noun.
  4. Yes. Must be monitored is a verb group - modal (must) + passive, infinitive form of monitored.
  5. Yes. Like to buy is another verb group.

IV

  1. Subject. 'You' are the doer of the action going.
  2. Object. We are the ones doing (or not doing) the needing.
  3. Object. People are the doers of the action of buying the popcorn.
  4. Subject. Tennis star is the subject of a sentence in the passive.
  5. Object. The subject 'you' is implied in this command. So 'you' are the eater of the meat.

V

  1. Complex. Because introduces the subordinate clause and sentence with one or more subordinate clauses are called complex ones.
  2. Complex. This sentence has an embedded clause introduced by the relative pronoun 'whose'. The 2 clauses could be rewritten as: The plane's engine failed. It managed to land safely.
  3. Compound. The two independent clauses are joined by the co- ordinating conjunction 'but'.
  4. Simple. This sentence with one finite verb consists of one clause.
  5. Complex. The subordinating conjunction since introduces the subordinate clause which in this sentence precedes the main clause.
  6. Compound. 'And' is the co-ordinating conjunction which links these two principal clauses. Note: The subject is omitted in the second clause because it is the same as the one in the first clause 'they'.