He has been talking for 2 years about his trip to Australia.
He has been looking for his book all the morning.
I have been wondering if i couldn't study German a little more.
He has been thinking about his girlfriend all the week.
We have been just talking about you.
I have been writing for you for about thirty minutes.
He has been sitting in that chair all the evening.
We have been traveling though Texas for 4 years.
We have been listening to the radio all the morning.
(?) have/has been waiting for the bus for half an hour.
Объяснение:
В последнем, т.к. вы не написали существительное в начале, я написала два варианта have/has. Если там было he/she/it то выберите has
When you are shopping online. first you go to the website. The first time you use a site you usually have to create an account, where you give your personal details. You then choose what you want to buy, and click on each item. If you are buying clothes, make sure you get the right size! Everything you buy goes into your shopping bag or basket, usually at the top right of the page. When you are ready to pay you click on proceed to checkout. You then have to give your delivery address where you want them to send your things, and give your payment details, for example your credit card number and expiry date. Many people today also buy and sell things online at auction sites like eBay.
2. Перегрузка линии может вызвать короткое замыкание.
3. Я хочу, чтобы ты объяснил природу электричества.
4. Инженер-электротехник видел, как быстро росло напряжение.
5. Считалось, что конференция проходила успешно.