Wiktionary:American Heritage most frequent wordlist
This list contains the 150 most frequent words (in order of frequency) in printed school English in the United States, according to the American Heritage Word Frequency Book. These words are probabably among the most frequent in all printed English everywhere, and probably among the most frequent in spoken English as well.
The first 13 words (in bold) account for more than 25% of all words in print. One hundred words account for approximately 50% of all words in print.
the - of - and - a - to - in - is - you - that - it - he - for - was - on - are - but - what - all - were - when - we - there - can - an - your - which - their - said - if - do - into - has - more - her - two - like - him - see - time - could - no - make - than - first - been - long - little - very - after - words - called - just - where - most - know - get - through - back - much - before - also - around - another - came - come - work - three - word - must - because - does - part - even - place - well - as - with - his - they - at - be - this - from - I - have - or - by - one - had - not - will - each - about - how - up - out - them - then - she - many - some - so - these - would - other - its - who - now - people - my - made - over - did - down - only - way - find - use - may - water - go - good - new - write - our - used - me - man - too - any - day - same - right - look - think - such - here - take - why - things - help - put - years - different - away - again - off - went - old - number