distractors: swap exist influence
sentence: Next you will find an  experienced  builder.And together with the builder you will make a  plan  ,The builder will draw it.The builder will also  work out  the cost of your house.He will estimate the cost of the wood,the glass,and everything else that he must use in building the house.Later on,when he starts to build,this estimate must  be corrected  ,because the prices may  [MASK]  ,and many other thing may happen between the time when he makes the estimate and the time when he builds the house.