to predict
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to predict
To make a statement about what will probably happen in the future, often based on knowledge, data, or observations. Synonymous with 'prognostizieren' (to forecast) or 'voraussagen' (to predict).
Meteorologen können das Wetter für die nächsten Tage ziemlich genau vorhersagen.
Meteorologists can predict the weather for the next few days quite accurately.
'Vorhersagen' is a separable verb with the prefix 'vorher-'. In a main clause, the prefix goes at the end. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Der Experte sagt eine positive Entwicklung voraus.
The expert predicts a positive development.
The verb is made up of 'vorher' (beforehand) and 'sagen' (to say). So it literally means to say something before it happens. This structure helps you understand and remember the meaning.
Niemand hätte diesen Ausgang vorhersagen können.
No one could have predicted this outcome.
The verb 'vorhersagen' (to predict) can be used with an accusative object, a subordinate clause with 'dass' (that), or an indirect question with a W-word.
Die App sagt Regen für morgen vorher.
The app predicts rain for tomorrow.
'Vorhersagen' (to predict) is often used in connection with the weather, the future, economic developments, or the results of elections and sporting events.
Analysten sagen für das nächste Quartal ein starkes Wachstum vorher.
Analysts predict strong growth for the next quarter.
to expect
'erwarten' and 'vorhersagen' both have to do with the future. 'erwarten' means that you assume or expect that something will happen. This can be a personal assessment. 'vorhersagen' means that you make a statement about the future, often based on knowledge, data, or observations. Learners may confuse the words because both express that something will probably happen. The difference is: if you 'erwartet' something, you expect it; if you 'vorhersagt' something, you tell others it as a prediction.
Der Wetterdienst hat für das Wochenende starken Regen vorhergesagt.
The weather service predicted heavy rain for the weekend.
Wir erwarten morgen viele Gäste im Restaurant.
We expect many guests at the restaurant tomorrow.