1.A selfish person is incapable <em><u>of</u></em> true friendship.
2.How much time do you spend <em><u>on</u></em> homework?
3.Good friendship should be based <em><u>on </u></em>mutual understanding.
4.Do you keep in touch <em><u>with</u></em> any school friends?
5.Some adults have a total lack <em><u>of</u></em> sympathy <em><u>for</u></em> young people.
6.She had been briefly acquainted <em><u>with</u></em> him more than 20 years earlier.
7.Some people take <em><u>up</u></em> interest with enthusiasm, but they are soon tired <em><u>of</u></em> it.
8.She has learnt English for three years, and she is good <em><u>at</u></em> English now.
9.I wish Carol would take a holiday. It would be good <em><u>for</u></em> her health.
10.Mary always takes care <em><u>of</u></em> her children carefully.
11.It was very kind <em><u>of</u></em> you to help me with that difficult work.
12.You were very kind <em><u>to</u></em> me when I asked you for some help.
Answer:
1. Yesterday, the cobbler mended your shoes.
2. We raised the flag a short time ago.
3. He shot it down this month.
4. They left ten minutes ago.
5. Yesterday, the doctor gave him an injection.
Explanation:
I have been able to rewrite the sentences in the Simple Past Tense adding the expressions in the brackets.
The simple past tense is known to be a verb tense which talks about actions or activities that took place or existed before now.
Such tenses are used to describe and explain the events that took place in the past. In English, regular verbs actually form the simple past tense "-ed" while other irregular verbs can take different forms.
Despite adding the expressions in the brackets while rewriting the sentences, the simple past tense is still retained.