Choose the right tense 1. the leaning tower of pisa (not fall) , it (roll) . the tower (start) to move southward in september and this (continue) until january. 2. the debate about the chinese dinosaur discovery stili (go on) . 3. scientists (debate) how old dinosaur fossils are, with estimates ranging from around 120 million years to about 140 million or older. 4. prior research (suggest) that ancestors of birds belonged to the same class of dinosaurs that sinosauropteryx occupies. 5. most colleges (hold) retake examinations twice a year, in january and in june. 6. the depleted оzone layer above the antarctic and arctic (transmit) far more ultraviolet-b radiation to the surrounding seas. 7. the world (warm) at the accelerated rates predicted by the ippc (intergovernmental panel on climate change) as concentrations of carbon dioxide and other greenhouse gases go on building up in the atmosphere. 8. british negotiators (report) third world nations regard access to western environmentally-friendly technologies “as of almost equal importance to financial resources”.
Например,
Tom isn't here,is he?
I don't like meat,do I?
He can swim,can't he?
В первой части предложения констатируется факт.Во второй - идет вопрос,совершенно противоположный первой части.Если в первой части идет положительное заявление -‘Он умеет плавать‘,то во второй будет ‘не так ли?‘
Либо ‘Я не люблю мясо‘.И ответ ‘не так ли?‘
При этом всем в первой части может быть is,во второй - isn't.Либо,в первой didn't,во второй - did.В первой would,во второй - wouldn't.То есть все наоборот.
Вот тебе таблица: