Spelling list: Prefixes which change

When adding a prefix you sometimes have to drop or change a letter.

welcome	You are welcome to give him my phone number.
welfare	I care about the welfare of badly treated horses.
always	My shoes are always shiny.
almost	He was almost six feet tall. *
although	Although it was raining, the children still wanted to go out to play. *
impossible	It's impossible to hear you.
import	Is it against the law to import fresh meat?
impersonate	I will call and impersonate my friend's voice.
illegal	The traffic warden gave me a ticket for illegal parking.
illiterate	An illiterate person cannot read or write.
immature	The behaviour of some children was immature,. *
irresponsible	It is irresponsible to drive so fast in a town.
irrelevant	The judge said that the evidence was irrelevant.