IV.Use: infinitive form or -ing form (Gerund) 1. We would like (to go) skiing at the weekend. 2. He wants (to take) part in the competition. 3. The
children must (to keep) everything in order. 4. I was really looking forward to (to go) to the cinema.
5. Let me (to help) you with your home task!​

Eco-tourism is a form of tourism. It's involving visiting fragile, pristine, and relatively undisturbed natural areas. Also, eco-tourism means responsible travel to natural areas that conserves the environment and improves the well-being of local people. It gives the tourist the opportunity to broaden their mind, to discover new ways of life, to meet interesting people, to improve their knowledge in history and geography.

In Russia, ecotourism is only taking it's very first steps. So this type of tourism is not popular there yet. Nevertheless, every year more and more people find out about this type of tourism. Nowadays, the most well-known national nature parks in Russia among tourists are: Elk Island, Curonian Spit and Russian North.

As for me, I would like to go on an eco-tour someday. I always wanted to visit Altai Krai, because of the mountains of this city.

как-то так

удачи!

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.