Base form of Verb

The base form of the verb is the form of verb in which the verb appears in the dictionary i.e. it is free from agreement, tense, or participle endings. 

The base form of verb is used after:

1. The subjunctive mood. 

• The deal requires that industrialists join the union.

2. The modal auxiliary                                                                                                                        

• I can speak Mandarin.

3. The infinitive marker to                                                                                                                        

• It is time to go.

4. After verbs of seeing or hearing                                                                                                    

• We watched them play Cricket.

Coordinating Conjunctions

A coordinating conjunction joins two or more grammatically equal structures.

The seven coordinating conjunctions are remembered as "A.B. Fonsy" : and, but, for, or, nor, so, yet.

• Bad weather set in, so we left.
• The federal government could raise taxes, or it could reduce expenditures.

Joining Independent Clauses

The independent clauses (IC) of a compound sentence must generally be joined in one of the following 3 ways:

1. IC ; IC
2. IC , conjunction IC
3. IC ; conjunctive adverb (placement optional), IC

In general

1. Use a semicolon alone when the clauses are short comparatively and relation between them is obvious.

• Self-denial is not a virtue; it is only the effect of prudence on rascality.

2. Use a coordinating conjunction ( and, but, for, or, nor, so, yet) when you want to indicate the relation clearly.

• The firefighters fought hard, yet they could not save the building.

3. Use a conjunctive adverb when it can show the relation more precisely than a conjunction does.

• Alice supplemented her class instruction with weekly visits to a tutor; thus her writing steadily improved.