Patterns of verb conjugation

Japanese verbs have various patterns of conjugation.
You had better learn 6basic patterns of verb conjugation.

iku : go

ikanai : go+not eg. Watashi-wa ikanai ; I don't go
ikimasu: go(polite) eg. Watashi-wa ikimasu ; I go.
iku : go(plain) eg. Watashi-wa iku. ; I go
ikutoki : go+when eg. Watashi-ga ikutoki ; When I go
ikeba : go+if eg. Watashi-ga ikeba ; If I go
ike : go (imperative) eg. Ike. ; Go.

Conjugation of verbs is very difficult grammar to learn.
The more you meet many verbs, then the more you understand them deeply.

taberu : eat

tabenai : eat+not
tabemasu : eat (polite)
taberu : eat (plain)
taberutoki : eat+when
tabereba : eat+if
tabero: eat (imperative)

okiru : wake up

okinai : wake up+not
okimasu : wake up (polite)
okiru : wake up (plain)
okirutoki : wake up+when
okireba : wake up + if
okiro : wake up (imperative)

nomu : drink

nomanai : drink + not
nomimasu : drink (polite)
nomu : drink (plain)
nomutoki : drink + when
nomeba : drink + if
nome : drink (imperative)

miru : watch, look, see

minai : watch + not
mimasu : watch (polite)
miru : watch (plain)
mirutoki : miru+when
mireba : miru+if
miro : watch (imperative)

yomu : read

yomanai : read+not
yomimasu: read (polite)
yomu : read (plain)
yomutoki : read + when
yomeba : read + if
yome : read (imperative)

maiasa : every morning
shimbun : newspaper

Watashi-wa maiasa shimbun o yomu.: I, every morning, newspaper, read. : I read newspaper every morning.

Watashi-wa shimbun o yomanai.: I, newspaper, read not.: I don't read news paper.
Watashi-wa shimbun o yomimasu. : I, newspaper, read. : I read newspaper.
Watashi-wa shimbun o yomu. : I, newspaper, read. : I read newspaper.
Watashi-ga shimbun o yomutoki....: I, newspaper, read when, : When I read newspaper,....
Watashi-ga shimbun o yomeba....: I, newspaper, read if, : If I read news paper,....
Shimbun o yome. : newspaper, read(imperative) : Read newspaper.