Ce sac est gros.

Ce means this (or sometimes that, depending on context).

In Ce sac est gros, sac is a masculine singular noun, so ce is the correct demonstrative adjective.

The forms are:

• ce
  • masculine singular noun beginning with most consonants
    
    • ce sac
• cet
  • masculine singular noun beginning with a vowel or mute h
    
    • cet homme
• cette
  • feminine singular noun
    
    • cette table
• ces
  • plural noun
    
    • ces sacs

So it is ce sac because sac is masculine singular and starts with s.

Because ce already works as a determiner, just like this in English.

In French, you normally use only one determiner before a noun:

• ce sac = this bag
• un sac = a bag
• le sac = the bag

You do not say ce un sac or ce le sac.

So ce sac is a complete noun phrase by itself.

Sac is masculine: le sac.

Unfortunately, you often cannot tell a noun’s gender just by looking at it, so gender usually has to be learned with the noun. That is why it is helpful to memorize nouns with their article:

• le sac = bag
• la table = table

In this sentence, the masculine gender shows up in ce and in the adjective gros.

Est means is.

It is the third-person singular form of the verb être (to be):

• je suis = I am
• tu es = you are
• il/elle/on est = he/she/it is

So:

• Ce sac est gros = This bag is big

Here, gros comes after est, not directly after the noun, because it is being used with the verb to be.

The structure is:

• Ce sac = subject
• est = verb
• gros = adjective describing the subject

This is the same basic pattern as English:

• This bag is big

So the adjective is not really being placed after the noun in a noun phrase like a big bag. Instead, it is part of the predicate: is big.

Here, gros means big, large, or bulky, depending on context.

For objects like sac, gros often suggests that something is large in size or quite bulky, not just tall or long.

It can also mean fat when describing a person or animal, but in this sentence it clearly describes the bag, so big is the natural meaning.

Because sac is masculine singular.

French adjectives usually agree with the noun they describe in gender and number:

• masculine singular: gros
• feminine singular: grosse
• masculine plural: gros
• feminine plural: grosses

So:

• Ce sac est gros = This bag is big
• Cette valise est grosse = This suitcase is big

Usually, in gros by itself or at the end of a sentence, the s is not pronounced.

A common pronunciation is roughly:

• gros → gro

So Ce sac est gros sounds approximately like:

• suh sak eh gro

However, in some connected speech situations, especially before a vowel, French may use liaison, and the final consonant can be heard in some forms. But in this exact sentence, gros is sentence-final, so the s is normally silent.

A simple approximate pronunciation is:

• Ce sac est gros → suh sak eh gro

A slightly more careful breakdown:

• ce → suh
• sac → sak
• est → eh
• gros → gro

In natural speech, French flows smoothly, so it may sound a bit like:

• suh-sa-keh-gro

But the clearer beginner version suh sak eh gro is a good place to start.

Yes. In many situations, ce can correspond to either this or that in English.

French often does not make the this/that distinction as strongly as English does unless extra words are added:

• ce sac-ci = this bag
• ce sac-là = that bag

So Ce sac est gros could sometimes be understood as either:

• This bag is big
• That bag is big

But if the meaning shown to the learner is this bag is big, that is perfectly normal.

Yes, but it means something slightly different in structure.

• Ce sac est gros = This bag is big
• Ce gros sac = This big bag

In Ce sac est gros, gros comes after est and makes a full sentence.

In Ce gros sac, gros is directly attached to sac inside the noun phrase. Interestingly, gros is one of the common adjectives that often comes before the noun in French.

So both are correct, but they are used differently.

French has several words that can translate as big, but they are not always interchangeable.

• grand often refers to size, height, or sometimes importance
• gros often suggests thickness, bulk, or largeness in a chunky way

For a bag, gros can sound very natural if the idea is that it is bulky or large.

So Ce sac est gros is a normal sentence, but in another context someone might also say Ce sac est grand, depending on the exact kind of big they mean.