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Prepositions after verbs

Seal in or seal with?

Seal in usually means keep something inside, while seal with names the material or method used to close something.

Quick answer

When to use seal in and seal with

Use seal in when something is enclosed or trapped inside. Use seal with when you mention the material, tool, or substance used to close or protect something.

The bag keeps moisture sealed in.
They sealed the envelope with wax.
Modern windows are sealed with rubber strips.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
seal in + substance/object

Keeping something enclosed

Seal in means to trap or preserve something inside a container, layer, or space.

The packaging helps keep flavour sealed in.
A tight lid keeps the heat sealed in.
2
seal with + material/tool

Naming the sealing method

Seal with introduces the material or tool used to close or protect something.

The crack was sealed with silicone.
She sealed the letter with glue.
3
seal + object

Closing or securing something

Seal can also be used without a following preposition when the object is direct.

Seal the container before shipping.
The technician sealed the pipe yesterday.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
seal in
The special wrapper seals in freshness.
keeps something trapped or preserved inside
seal with
They sealed the box with tape.
shows the material or method used for sealing
seal by
The door was sealed by the emergency team.
by introduces the agent, not a fixed verb-preposition pattern

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using seal with for enclosed contents

Use seal in when the meaning is keeping something inside.

✕ The bottle seals with the flavour. ✓ The bottle seals in the flavour.

Adding an unnecessary preposition

Seal can take a direct object without another preposition.

✕ Please seal up the form with your signature. ✓ Please seal the form with your signature.

Confusing material and content

With introduces the sealing material, not the thing being trapped.

✕ The lid sealed with the steam. ✓ The lid sealed in the steam.

Quick practice

Choose the expression that matches the intended meaning.

1. The package keeps the aroma ___ .
2. They sealed the envelope ___ wax.
3. The emergency exit was sealed ___ the police.

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Frequently asked questions

Can seal in be passive?

Yes. You can say something is sealed in, such as Heat was sealed in by the insulation.

Is seal with always about materials?

Usually it introduces a material, substance, or tool such as glue, wax, or tape.

Can I say seal into?

Seal into is possible when movement into a space is meant, but it is less common than seal in.

sack, by, sack, for, sack, from "sacrifice for" or "sacrifice to"? sail from, in, for, to or through? "salvage from" or "salvage in"? sanction by, for, in, with or according? satisfy with, by, in, about or after? "saturate with" or "saturate in"? save by, for, from, on or in? "say in", "say about" or "say to"? "scan for", "scan in" or "scan through"? "scar by" or "scar on"? scatter in, across, around, throughout or on?

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