Question

if someone__(enter)the building the alarm __ (go off)​

Answer 1

Answer:

If someone enters the building the alarm will go off

The Zero Conditional: (if + present simple, ... present simple) ...

The First Conditional: (if + present simple, ... will + infinitive) ...

The Second Conditional: (if + past simple, ... would + infinitive) ...

The Third Conditional. (if + past perfect, ... would + have + past participle)

Answer 2

If someone enters the building the alarm will go off.

Explanation:

• The given sentence is future tense.

• "s" and "es" are added with the singular nouns, in every tense i.e. present, past, or future.

• As will and shall are modal verbs and are used to show the possibility of action.

• Normally, "Will" is used with the second or third person, and "Shall" is used with the first person.