<span>give the book (i think)</span>
If the verb in the independent clause is in the present tense, the tense that the verb in the indirect quotation should be is <span>remain in its original tense.
</span>You don't have to shift tenses because it is present in the independent one.
For example:
He says: "I need to wash my hair."
He says that he needs to wash his hair.
You wouldn't say - he says that he needed to wash his hair.
Answer:
We now know ketchup as a tomato sauce, but that was not always the case.
Explanation:
The point of a topic sentence is to be a summary of the paragraph that follows.
"We now know ketchup as a tomato sauce, but that was not always the case" would be a suitable summary sentence for the paragraph, compared to "Many foods are prepared differently over time", which is very vague and could apply to many different things.
A concise and straight-to-the-point topic sentence is ideal.
Hope this helps!
