Sentence Analysis: 1. Correct: This sentence is grammatically correct and uses the future tense appropriately to express a planned event.
2. Correct: This sentence is grammatically correct and uses the future simple tense to express a future action.
3. Correct: This sentence is grammatically correct and expresses gratitude.
4. Incorrect: The sentence should use the future simple tense to express a prediction about the future.
Corrected: In the future, electric bikes may replace bicycles.
5. Correct: This sentence is grammatically correct and uses the future simple tense to express a planned event.
6. Incorrect: The sentence should use the present continuous tense to express a future action that is planned or arranged.
Corrected: Linh is so nervous! She is having a baby.
In summary, sentences 1, 2, 3, and 5 are correct. Sentences 4 and 6 need to be corrected to use the appropriate future tense.