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004-005-Natural Grammar 1 - UNIT 01_006-007-Unit 01-TB.qxd 19/12/2016 7:17 μμ Page 4
Unit 1 the indefinite article
A train!
And a bus! And an aeroplane!
the indefinite article
a before consonant sounds: b,c,d,f,g,h,j,k,l,m,n,p,q,r,s,t,v,w,x,y,z
an before vowel sounds: a,e,i,o,u
a horse but an hour
a unit but an umbrella
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