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Prepositions after verbs

Speculate on or speculate about?

Both speculate on and speculate about are standard. They are close in meaning and both refer to forming ideas without complete facts.

Quick answer

Speculate on vs speculate about

Use speculate on or speculate about to discuss possibilities or uncertain information. On is slightly more formal in some contexts, especially in journalism or academic writing.

Analysts speculated on the cause of the outage.
Fans speculated about the sequel for months.
Experts continue to speculate on future trends.

Choose the pattern by meaning

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

1
speculate on + topic

Discussing uncertain possibilities

On is common in formal discussion and reporting.

Researchers speculated on the long-term effects.
2
speculate about + topic

Talking informally about possibilities

About is natural in everyday conversation and general writing.

Neighbours speculated about the new owners.
3
speculate that + clause

Introducing a full idea or claim

That clauses are common after speculate.

Some economists speculated that inflation would fall soon.

See the difference in context

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

Construction
Example
Meaning
speculate on + topic
Commentators speculated on the election result.
Standard and slightly formal.
speculate about + topic
People speculated about his absence.
Standard and conversational.
speculate that + clause
They speculated that the deal would fail.
Introduces a complete proposition.

Common mistakes

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

Using speculate with a direct object alone

Speculate is not normally followed directly by a noun without a preposition.

✕ They speculated the reason. ✓ They speculated about the reason.

Using on with a person instead of a topic

On usually introduces a subject or issue, not the person being discussed.

✕ We speculated on him. ✓ We speculated about him.

Quick practice

Choose the expression that matches the intended meaning.

1. Journalists began to ___ the company merger.
2. Friends often ___ celebrity relationships online.
3. Some analysts speculated ___ interest rates would rise.

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Frequently asked questions

Are speculate on and speculate about both correct?

Yes. Both are standard and very similar in meaning.

Is one more formal than the other?

Speculate on can sound slightly more formal in news or academic contexts.

Can speculate be followed by that?

Yes. You can say speculate that something may happen.

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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