[steve24183309]

How do I locate the grammar point in the following:

10. In the following, "I used to jog every morning", the grammar point most likely is

A. past tense in "used".
B. infinitives with nouns.
C. past habitual action in "used to".

11. In the following, "Do you know the person to whom you were speaking ?", the grammar point most likely is

A. question formation in present tense.
B. past tense in "were".
C. use of the adjective clause ‘to whom you were speaking’.

12. In the following, “He was sleeping when the phone rang” the grammar point most likely is

A. a comparison of two past actions.
B. the spelling of an "f" sound with "ph".
C. the use of "was" with "he" in past.