a) Read the text, then look at the highlighted -ing and infinitive forms. Which form do we use: after modal verbs, after adjectives, to show purpose, after certain verbs (decide, appear), after prepositions, as a noun, after expressions (I'm busy, etc.), after certain verbs (fancy, start, avoid, spend, imagine, suggest, etc.)? Check in the Grammar Reference.
PSYCHIC ANIMALS
Hours before the huge tsunami off the coast of Sumatra reached land, some people noticed that the animals started acting strangely. For example, the elephants made lots of noise and decided to run to higher ground just before the waves hit. In the days that followed, wardens at Sri Lanka's Yala National Park were very busy looking for their animals and were surprised to find nearly all of them alive. So, did the animals know what was about to happen? If so, then this could mean that animals are capable of predicting natural disasters.
Many animals have much better hearing than human beings. They can hear certain noises at great distances. Others have sensitive feet, enabling them to feel vibrations in the ground. Migrating birds can sense changes in atmospheric pressure when they fly. Moreover, animals that live in groups sometimes have special cries to warn the others when danger is near.
Although we don't know for sure, animals may know more than we think. So if your pet starts acting strangely, maybe you should take notice. They could be trying to tell you something!
b) Put the verbs in brackets into the correct infinitive (with or without to) or -ing form. 1 Her father always tells her ..... (study) hard at school. 2 Do you like ..... (play) the piano? 3 Poppy needs ..... (say) sorry to her sister. 4 I'm bored! Do you fancy ..... (listen) to music with us? 5 We must ..... (visit) grandpa this weekend. 6 I've never been to a summer camp but I'd like ..... (go) one day.
a) После модальных can, could, may употребляется инфинитив без to: can hear, could mean, may know. После прилагательного surprised — to find; для цели — to warn; после decide — to run. После предлогов for и of — looking, predicting. Существительное-действие hearing и определение migrating имеют форму -ing. После busy — looking; после start — acting.
b)
a) After modal verbs — bare infinitive; after adjectives, for purpose and after decide — to-infinitive; after prepositions, as a noun, after busy and after start — -ing form.
b)
