Annika has been here since yesterday. This is the correct sentence.
The subject and the verb must be singular or plural for the sentence to be grammatically correct. That is, the subject and verb tenses must match.
He hears an echo when two words are in a sentence, like "that" or "this". But it's not necessarily wrong. Unless it's a typo (when you type "the the"), the words serve different purposes.
From can also be used with the prepositions "to" and "until" to indicate the beginning and end of an action or state. Usually "from...to" is used in the past tense and "from...to" is used when talking about future actions. However, "from...to" can be used in most situations.
Sentences follow the subject + verb + object word order. He (subject) got his degree (object) (verb).
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