El vocabulario núcleo es la base estructural del idioma: con él puedes generar todas las oraciones que necesitas para comunicarte. Es pequeño en cantidad, pero enorme en función, especialmente cuando se compara con vocabularios especializados.
| Vocabulario núcleo del idioma inglés: | ||||||
| A | B | G | L | O | T | W |
| A | Beside | Get | Let | Ought | These | Whoever |
| Able | Besides | Go | Like | Our | They | Won’t |
| Above | Beyond | Good | Long | Ours | This | Worse |
| Aboard | Both | Going to | Lower | Ourselves | Thing | Worst |
| About | Body | Gonna | Loud | Out | Those | Would |
| Accordance | Briefly | Goodbye | Lowest | Outside | Though | Wouldn’t |
| According | Busy | Granted | Likewise | Over | Through | Would’ve |
| Accordingly | But | Guy | ‘ll | Own | Throughout | Y |
| Across | By | H | M | Otherwise | Today | Yes |
| Addition | Bad | Had | ’m | P | Together | Yesterday |
| After | C | Hadn’t | Many | Past | Tomorrow | Yet |
| Against | Can | Hard | May | Perhaps | Tonight | You |
| Again | Cannot | Has | May’ve | Place | Too | Your |
| Ahead | Can’t | Hasn’t | Meanwhile | Please | Top | Yours |
| Ago | Concerning | Have | Me | Per | Toward | Yourself |
| Ain’t | Considering | Haven’t | Might | Q | Towards | Yourselves |
| All | Counting | Hi | Mine | Quick | Twice | |
| Already | Could | Hello | Month | R | U | |
| Although | Couldn’t | Her | Moreover | Regarding | Under | |
| Always | Could’ve | Here | More | ‘re | Until | |
| Almost | D | Hers | Morning | Right | Unless | |
| Also | ‘d | Herself | Most | Round | Up | |
| Along | Day | He | Mostly | S | Underneath | |
| Am | Date | He’s | Much | Say | Upper | |
| Among | Despite | Hence | Must | Several | Upon | |
| Amongst | Do | Him | Must’ve | Shall | Us | |
| An | Don’t | Himself | My | She | Used | |
| And | Does | His | Myself | She’s | Useful | |
| Another | Doesn’t | How | N | Should | V | |
| Any | During | However | Near | Shouldn’t | Very | |
| Anybody | Due | I | Neither | Should’ve | “ve | |
| Anything | Down | I | Next | Since | Via | |
| Anyone | E | If | Night | Slowly | W | |
| Apart | Each | In | No | So | Wanna | |
| Are | Either | Indeed | No one | Some | Was | |
| Around | Else | Included | Nowadays | Someone | We | |
| Aren’t | Enough | Including | Non | Somebody | Week | |
| As | Even | Ing | Nor | Something | Well | |
| Aside | Ever | Inside | Not | Soon | Were | |
| At | Everybody | Incidentally | Notwithstanding | Still | What | |
| Away | Everywhere | Instead | Nothing | Spite | Whatever | |
| Awhile | Except | Into | Now | Such | When | |
| B | Excluding | Is | O | ‘s s’ | Whenever | |
| Back | Early | isn’t | O’clock | T | Where | |
| Backward | Every | It | Of | Tell | Whereas | |
| Backwards | F | Its | Often | Till | While | |
| Be | Far | It’s | Off | That | Which | |
| Been | Fast | Itself | Ok | The | Whether | |
| Before | Few | J | On | Their | Who | |
| Behalf | Forth | Just | Once | Theirs | Whom | |
| Best | Forward | L | One | Them | Whomever | |
| Better | Free | Later | Only | Themselves | Whose | |
| Below | From | Last | Onto | Than | Why | |
| Between | For | Least | Off | Thanks | Will | |
| Because | Front | Little | Opposite | Then | With | |
| Behind | Further | Left | Or | There | Within | |
| Beneath | Less | Order | Thereby | Without | ||
| Other | Therefore | Who | ||||
