They build a house next to mine.
in any practical context is used as present non-finite, not usable in simple present context. Its non-finite contexts is mostly in the subjunctive sense.
Non-finite speech is modular. In modular functions, the module could be deployed within a range of contexts regardless of time, number, gender, without modifying its basic structure.
Difference between a tense and the context
For examples, the verbal noun painting as well as the gerund painting.
The Mona Lisa is a well-known painting. The tense of the word painting in such a sentence is in the present continuous. However, the context of its use is as a verbal noun.
He is very good at painting fake Mona-Lisa's. The continuous present form in this sentence is used in the context as a gerund.
Gerund ending in -ings?
What are non-finite contexts
Non-finite means unbounded in time, number, possibly gender.
The most well-known and oft-used non-finite is the infinitive.
- We came here {to die}.
- You need {to stop sleeping around}.
- They will be told {to stop sleeping around} tomorrow.
What is subjunctive
Subjunctive is a non-finite context operating in imaginary time. Most of the time, subjunctive contexts are sufficiently constructed using past tenses.
Use of subjunctive form
However, subjunctive context is not a tense. It too, like the "real world" context, can have past, present, future, simple, continuous or completed tenses.
For examples,
Dad: What do you do when a stranger tries to abduct you?
- Boy: I kick him in the shin.
Mafia boss: What do your brothers do when you go to jail?
- Mafiosi: They take care of my family.
What do compulsive relatives do when they each want an inch of my inheritance? Well, they build their houses next to mine.
What does the govt do when they fail to grab my land by eminent domain? They build a bridge over my property.