Marie assure Paul avec la corde.

This is the normal French sentence pattern: subject + verb + direct object.

• Marie = subject
• assure = verb
• Paul = direct object

So Marie assure Paul follows the same basic order as Marie helps Paul would in English.

French can change the order for emphasis in some cases, but this version is the most neutral and standard one.

Because Paul is a direct object here.

In this sentence, assurer takes the person directly:

• assurer quelqu’un

So you say:

• Marie assure Paul

not:

• Marie assure à Paul

That is a very common thing for English speakers to notice, because English sometimes uses to where French does not.

Assure is the present indicative, third person singular, from the verb assurer.

It matches Marie, which is a third-person singular subject.

So depending on context, it can translate as:

• Marie assures Paul
• Marie is assuring Paul

French present tense often covers both the simple present and the English present progressive.

Avec la corde is a prepositional phrase.

• avec = with
• la corde = the rope

In this sentence, it tells you the means/instrument used in the action. In other words, it explains that the action is being done with the rope.

So the structure is:

• Marie — subject
• assure — verb
• Paul — object
• avec la corde — how / by means of what

Normally, it describes the action.

So the natural reading is that Marie uses the rope in order to assure Paul.

French learners sometimes wonder whether it could mean that Paul has the rope or Marie is together with the rope, but in ordinary usage the phrase is understood as an instrument phrase attached to the verb.

La corde uses the definite article la, meaning the rope.

That usually suggests the rope is:

• already known from context,
• specific,
• or understood in the situation.

If you wanted to mean a rope, not a specific one, you would usually say:

• Marie assure Paul avec une corde.

French uses definite articles very often, sometimes more often than English learners expect.

Not always. This is an important point.

French assurer can correspond to several English ideas depending on context, such as:

• to assure
• to reassure
• to secure
• to insure
• in some contexts, even a specialized meaning like to belay

So a learner should not assume there is always a perfect one-to-one match with English assure.

The exact meaning comes from the context, not just the dictionary form.

Because Paul is a proper noun—a person’s name.

In French, names normally do not take an article in sentences like this.

So:

• Marie assure Paul

not:

• Marie assure le Paul

French does use articles with common nouns, such as:

• Marie assure le garçon.

But names usually appear without one.

Yes. Since Paul is the direct object, you would replace him with a direct object pronoun:

• Paul → le
• before a vowel sound, le becomes l’

So:

• Marie assure Paul avec la corde.
• Marie l’assure avec la corde.

That is a very useful pattern to learn, because French object pronouns usually come before the verb.

Yes, but the basic sentence you have is the most neutral one.

For example, you could move the prepositional phrase for emphasis:

• Avec la corde, Marie assure Paul.

This still means the same thing, but it puts more focus on the rope.

So French does allow some flexibility, but Marie assure Paul avec la corde is the straightforward default order.