There are many different ways to write and pronounce numbers in English. Here are a few common ways to write and say the numbers from 1 to 20:

1 – one (wuhn)
2 – two (too)
3 – three (three)
4 – four (fohr)
5 – five (five)
6 – six (siks)
7 – seven (sev-uhn)
8 – eight (eyt)
9 – nine (nyn)
10 – ten (ten)
11 – eleven (ih-leh-vuhn)
12 – twelve (twelv)
13 – thirteen (thur-teen)
14 – fourteen (fawr-teen)
15 – fifteen (fih-teen)
16 – sixteen (sihk-steen)
17 – seventeen (sev-uhn-teen)
18 – eighteen (ey-teen)
19 – nineteen (nahyn-teen)
20 – twenty (twen-tee)

Note: For numbers ending in "teen," the pronunciation follows the same pattern as "thirteen" and "fourteen," with the emphasis on the first syllable.

Additionally, there are some variations in the pronunciation of numbers between British and American English. For example, "three" is pronounced "three" in American English, but in British English it is often pronounced "tree." It is important to note which pronunciation is more common in the region you are speaking or learning in.