правило past simple и past continuous на объясните ​

Past Simple употребляется тогда, когда действие произошло в единожды, "было и было". Например, В году я нарисовал картину. На неделе приезжал цирк. Вчера я ходил в гости.

Past Continuous - это действие, совершаемое в момент речи в Например: Когда мама зашла в комнату, я делал уроки (то есть не просто сделал, а в тот данный момент я писал/читал) или Вчера с 4 до 5 вечера я разговаривала по телефону - действие продолжалось какое-то время.

Объяснение:

A. I have never broken my arms and legs. 5.Present Perfect
b. He has check-ups twice a year. 1.Present Simple
c.The doctor advised me to keep to a diet. 2.Past Simple
d. My father was taken to hospital. 8. Past Simple Passive
e. I'm doing aerobics. 3.Present Continuous
f. Children are usually given advice to eat a lot of fruit and vegetables.7.Present Simple Passive
g. The doctor was examining the patient.4.Past Continuous 
h. When the mother came 2.Past Simple home, her son had already taken 6.Past Perfect the tablet.

A. I have never broken my arms and legs. – Present Perfect
B. He has check-ups twice a year. – Present Simple
C. The doctor advised me to keep to a diet. – Past Simple
D. My father was taken to hospital. – Past Simple Passive
E. I'm doing aerobics. – Present Continuous
F. Children are usually given advice to eat a lot of fruit and vegetables. – Present Simple Passive
G. The doctor was examining the patient. – Past Continuous
H. When the mother came (Past Simple) home, her son had already taken (Past Perfect) the tablets.