Predict is not usually followed directly by by or in as fixed verb-preposition combinations. These prepositions are often part of time, method, or place phrases instead.
English normally uses predict without a fixed preposition: predict something, predict that, or predict whether. By and in can appear after predict when they introduce extra information such as method or time.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use predict directly with a noun phrase or clause.
By introduces the method or process used for prediction.
In usually belongs to a time or place phrase, not to the verb itself.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
Predict does not normally require by after it.
✕ They predicted by a crisis. ✓ They predicted a crisis.Use that for clauses after predict.
✕ She predicted in prices would rise. ✓ She predicted that prices would rise.Choose the expression that matches the intended meaning.
Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.
No. By usually introduces the method used to make a prediction.
Only when in introduces time, place, or context, such as in 2030 or in Europe.
Predict something, predict that, and predict whether are the main patterns.
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