Вечером мы заказали пасту с креветками, потому что никому не хотелось мяса.

In the evening, we ordered pasta with shrimp because nobody felt like eating meat.

Breakdown of Вечером мы заказали пасту с креветками, потому что никому не хотелось мяса.

• с: with
• не: not
• потому что: because
• мы: we

Questions & Answers about Вечером мы заказали пасту с креветками, потому что никому не хотелось мяса.

Why does вечером mean in the evening, and why isn’t there a preposition like в?

Вечером is the noun вечер in the instrumental case, used adverbially to mean in the evening / during the evening.

This is a very common Russian pattern for times of day:

• утром = in the morning
• днём = in the daytime / during the day
• вечером = in the evening
• ночью = at night

So Вечером мы заказали... means In the evening, we ordered...

You can also say в вечер, but that usually does not mean the same thing in normal speech. For ordinary time expressions, Russian typically uses утром / днём / вечером / ночью.

Why is it заказали and not заказывали?

Заказали is the perfective past tense of заказать, meaning ordered as a completed action.

Here the sentence describes a single finished event:

• We ordered pasta...

That is why perfective makes sense.

Compare:

• Мы заказали пасту. = We ordered pasta.
  (a completed act)
• Мы заказывали пасту. = We were ordering / used to order / did order pasta.
  (more about the process, repetition, or background context)

So заказали is the natural choice when telling what happened that evening.

Why is it пасту and not паста?