Speaking

10.Look at the following pictures and notes, then in pairs discuss what the problems of big cities are and how they can be solved.

Problems:noise, smog, congested roads, gas emission, acid rain, careless disposal of waist, unpleasant smells, unnecessary packaging, scrap heaps, dumping oil/toxic waste/outdated appliances and devices, water/ air / soil pollution, greenhouse effect, growth of population, unemployment

Solution:filters, unleaded petrol, better public transport, fines, biodegradable packaging, recycling, incinerate waste, develop new environmentally friendly materials, ban on careless disposal of rubbish, recycling factories/points, improved waste disposal systems, living outside the city/ in the suburbs, economy water and electricity, develop technologies, plant trees, ride a bicycle

Grammar Focus: Clause of Purpose:

(in order) to + infinitive so that + can/will + infinitive so that + can’t/won’t + infinitive

e.g.We should install filters toreduce air pollution.

We should install filters so thatwe can reduce air pollution.

We should install filters so that we won’t have polluted cities.