Скажите как правильно и объясните почему: mary and jane don't ride their bikes., или mary and jane don't rides their bikes.

Правильный первый вариант, потому что -s добавляется при 3 л. ед.ч., а это уже множественное, так что ride

1. he previously lived in london. he worked there for many years until he moved to manchester.2. the last time he played basketball two years ago. since he only played tennis.3. when they arrested him? - last week. behind it followed from the beginning of the year, but did not touch until he tried to leave the country. - i always considered him an honest man.4. he went to the library yesterday. there were a lot of visitors. - yes, the holidays began two weeks ago, but some students still have not passed the exam and continue to prepare for them.5. two years ago, they lived in south america. they recently returned. 6. where was he last year? - at the hospital. he was not talking to the doctor until his illness did not become too serious. he still has not completely recovered.7. they left the city for the summer and left his dog with us. they promised to take him, but still did not

birthday is a very wonderful day. everybody likes to celebrate it. it is a good opportunity to spend time with friends, parents, relatives.

i was born on the 10th of january. in the morning on my birthday my parents lay the presents near my bed. so the first thing i see when i open my eyes is my presents. my mom and daddy and my little brother come to my room to congratulate me and to sing "happy birthday".

usually we hold my birthday party in the evening. once we went to a cafe to celebrate my birthday, but usually we celebrate it at home. we clean the house the day before birthday. in the morning of birthday party day my father goes shopping and buys everything we need.

my mother bakes a cake or pie. by the evening food is cooked, the table is laid. we put on evening suits and dresses and wait for the guests. the flat looks nice and cosy. i am always very glad to meet my guests. i like to get flowers and presents. mom gives me the telegram from my aunt.

we have an abundant dinner on this day. mom brings in the birthday cake. i blow the candles out. we dance and sing songs, play games and laugh, joke, tell funny stories. i think that my birthday is one of the best days in a year.