Explanations
III
- Yes. Are going is a verb group.
- No. The verb here is 'is' which has been contracted. What's = what is ...
- No. Won't (will not) go is the verb group. Work in this sentence is a noun.
- Yes. Must be monitored is a verb group - modal (must) + passive, infinitive form of monitored.
- Yes. Like to buy is another verb group.
IV
- Subject. 'You' are the doer of the action going.
- Object. We are the ones doing (or not doing) the needing.
- Object. People are the doers of the action of buying the popcorn.
- Subject. Tennis star is the subject of a sentence in the passive.
- Object. The subject 'you' is implied in this command. So 'you' are the eater of the meat.
V
- Complex. Because introduces the subordinate clause and sentence with one or more subordinate clauses are called complex ones.
- 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.
- Compound. The two independent clauses are joined by the co- ordinating conjunction 'but'.
- Simple. This sentence with one finite verb consists of one clause.
- Complex. The subordinating conjunction since introduces the subordinate clause which in this sentence precedes the main clause.
- 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'.