erwarten
to expect
To assume or anticipate that something will happen in the future.
Ich erwarte, dass die Lieferung morgen ankommt.
I expect the delivery to arrive tomorrow.

to expect
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to expect
To assume or anticipate that something will happen in the future.
Ich erwarte, dass die Lieferung morgen ankommt.
I expect the delivery to arrive tomorrow.

The prefix 'er-' is inseparable. It remains firmly attached to the stem 'warten' in all tenses and sentence constructions.
Was erwartest du von diesem Treffen?
What do you expect from this meeting?
The context shows the exact meaning: If 'erwarten' is used with a person, it is often about that person's arrival. If the preposition 'von' follows, it is about a demand or expectation. If it is used with 'ein Kind' (a child), it means 'schwanger sein' (to be pregnant).
Wir erwarten wichtigen Besuch.
We are expecting an important visitor.
When you assume that something will happen, 'erwarten' is very often used with a subordinate clause introduced by 'dass' (that). The verb of the subordinate clause then comes at the end.
Ich erwarte, dass du deine Hausaufgaben bis morgen erledigst.
I expect you to finish your homework by tomorrow.
When you demand or hope for a performance or behavior from someone, the preposition 'von' with the dative is always used. The structure is: etwas von jemandem erwarten (to expect something from someone).
Der Chef erwartet von seinen Mitarbeitern vollen Einsatz.
The boss expects full commitment from his employees.
The phrase 'ein Kind erwarten' (to be expecting a child) is a fixed and very common expression for 'schwanger sein' (to be pregnant). It is often used as a polite and neutral paraphrase.
Das Paar erwartet im Sommer Nachwuchs.
The couple is expecting a baby in the summer.
to hope
'hoffen' and 'erwarten' can both point to something in the future. The difference lies in your attitude toward it. You use 'hoffen' when you wish for something positive but do not know for sure whether it will happen. 'erwarten' more often means that you expect or assume that something will happen. This can be positive, neutral, or even negative. Learners often confuse the words because both have to do with the future. As a guide: for a wish, you are more likely to say 'hoffen'; for an assumption, 'erwarten' is more likely.

Am Abend erwartet der Mitarbeiter eine Antwort von seinem Chef.
In the evening, the employee expects an answer from his boss.
Die Ärztin hofft, dass die Behandlung schnell hilft.
The doctor hopes that the treatment helps quickly.