This question tests your understanding of tenses and conditional sentences, specifically the structure used for a future event that is dependent on another future event.

The sentence is: "As soon as the guests ____ we ___ our party."

The phrase "As soon as" introduces a dependent clause (the condition) and is followed by an independent clause (the result). In such constructions, we use the simple present tense in the dependent clause to refer to a future action. The main clause, which states the result, uses the simple future tense.

Rule: After time conjunctions like as soon as, when, until, before, after, we do not use 'will' or 'shall' to talk about the future. We use a present tense instead.

Let's apply this rule step-by-step:

Step 1: Analyze the dependent clause ("As soon as the guests ____")
The subject is "the guests", which is plural. Therefore, the verb must agree with a plural subject. The simple present tense form for a plural subject is the base verb, which is "come". Options with "comes" (for a singular subject) or "will come" (using future tense) are grammatically incorrect in this clause.

Step 2: Analyze the independent clause ("we ___ our party")
This clause describes the result of the condition. Since it's a future plan, we must use the future tense. The future tense for the first-person plural ("we") is "shall begin" or "will begin". "Begin" alone is simple present tense, which is not appropriate here.

Conclusion: The correct words to fill in the blanks are "come" for the first blank and "shall begin" for the second blank.

The complete correct sentence is: "As soon as the guests come we shall begin our party."

Related Topics & Formulae

Key Grammar Rule:

Future Time Clause:
When a sentence has two parts, and one part begins with a time word (e.g., when, as soon as, before, after, until), the verb in the time clause is in a present tense, not a future tense. The verb in the main clause is in the future tense.

Formula:
$\text{As soon as}+\text{Subject}+\text{Present Tense Verb},\text{Subject}+\text{Will/Shall}+\text{Base Verb}$

Subject-Verb Agreement:
A singular subject takes a singular verb (verb + s), and a plural subject takes a plural verb (base verb).
Example: "The guest comes" vs. "The guests come".