in reception children should be taught s,a,t,i,p,n,c,k.ck,e,h,m,d,g,o,u,l,f,b,ai,j,oa, ie,ee,or,z,w,ng,v,oo, oo , y,x,ch,sh,th, th ,qu,ou,oi,er,ar,ue, air, ure ...
then in Y1 taught the the sound s can be written s, ss, sc, st, ci,cy,ce
(sun, grass, scissors, castle, circle, cycle, nice)