Сумоляю вас
первое делать не нужно​

Начните приглашение с обращения:
Dear friend- в зависимости от статуса человека, можно начать с приветствия:
Hello, имя" или "Hey, имя".
Дальше можно сразу писать текст приглашения:
I’d like to invite you to you for Valentine's Day.
Не забудьте написать, куда и в какое время вы приглашаете, например:
This week, on Sunday, I’m having a party at home. - На этой недели, в воскресенье, я приглашаю на вечеринку домой.
В конце письма выразите благодарность за внимание к письму:
Thank you for your attention.
И обязательно указывается контактное лицо, телефон.

I am going to be a doctor. I like this profession because doctors help people to be healthy and live long. Ambulance doctors often save human lives in emergency. Medical care is very complicated profession, it requires deep knowledge of chemistry, biology, anatomy and many other sciences. Doctors effectively study and upgrade their skills all over their career. Maybe I will be a dentist, they earn lots of money. 

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I am not going to be a mechanic. I'v never seen a mechanic girl. This profession is popular rather at boys because they like to deals with nuts and bolts and dirty noisy engines full of oil. Sometimes mechanics have to move hevay stuff by hands, sometimes they undo hard tightened nuts. This kind of job is definitely not for me. Also I am afraid of welding that mechanics do sometimes, I think it is not safe.