Modify the grammar checker of this chapter$$s Case Study, in the file recognizer.py$,$ so that it recognizes the following additional types of variations in phrases:

A verb phrase with no prepositional phrase $($example: $$The boy saw the girl$).$

A noun phrase in which the noun is modified by an adjective $($example: $$The girl hit the red ball with a bat$).$

A sentence that connects two independent clauses with a conjunction $($example: $$The boy saw the girl and the girl hit the red ball with a bat$).$

You should add new variables for the sets of adjectives and conjunctions. $($LO: $6\mathrm{.}2)$