這是新自然發音講義中可能算比比較不重要的部分，因為有些字大家都會唸了，不過不發音的規則還是知道一下比較不會唸錯。不發音的部份因為不好寫，所以可能用看的比較快。
雙子音字尾
| -ct | act | duct | fact | pact | |
| -ft | gift | lift | drift | shift | swift |
| -ld | cold | fold | gold | hold | scold |
| -lp | help | gulp | scalp | yelp | |
| -lt | belt | melt | felt | salt | fault |
| -mp | bump | jump | lump | pump | trump |
| -nd | and | brand | grand | stand | strand |
| -nk | ink | link | drink | blink | think |
| -nt | bent | cent | rent | tent | dent |
| -pt | apt | kept | slept | wept | |
| -rd | bird | guard | hard | yard | word |
| -rk | ark | bark | dark | mark | park |
| -sk | ask | desk | disk | mask | risk |
| -st | best | chest | just | dust | must |
不發音字母
| tch | catch | hatch | watch | switch |
| dge | judge | lodge | bridge | badge |
| wr | wrong | write | wrist | wrinkle |
| kn | know | knock | knee | knife |
| gn | gnaw | design | assign | resign |
| mb | comb | dumb | climb | tomb |
| ps | psychology | psycho | ||
| lk | talk | walk | stalk | |
| bt | debt | doubt | subtle | |
| h | hour | heir | honor | herb |
| is | island | aisle | debris | |
| ould | could | would | should |
