1.Keeping the enviroment clean is very important
⇒⇒ It is very important to keep the enviroment clean
2. I regret not buying some tickets for the concerts yesterday
⇒⇒ I wish I had bought some tickets for the concerts yesterday
3. Arthur said he was sorry he had hurt her feeling
⇒⇒ Arthur apologized for hurting her feeling
1.Keeping the enviroment clean is very important
⇒⇒ It is very important to keep the enviroment clean
2. I regret not buying some tickets for the concerts yesterday
⇒⇒ I wish i had bought some tickets for the concerts yesterday
3. Arthur said he was sorry he had hurt her feeling
⇒⇒ Arthur apologized her for hurting her feeling
1.Keeping the enviroment clean is very important
⇒⇒ It is VERY IMPORTANT TO KEEP the enviroment clean
2. I regret not buying some tickets for the concerts yesterday
⇒⇒ I wish I HAD BOUGHT some tickets for the concerts yesterday
3. Arthur said he was sorry he had hurt her feeling
⇒⇒ Arthur apologized FOR HURTING HER FEELING
1.Keeping the enviroment clean is very important
⇒ It is very important to keep the enviroment clean
2. I regret not buying some tickets for the concerts yesterday
⇒ I wish i had bought some tickets for the concerts yesterday
3. Arthur said he was sorry he had hurt her feeling
⇒ Arthur apologized her for hurting her feeling