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Should(n't) have
We use should(n't) have + past participle to say that what did or did not happen was a mistake or a bad thing:
I should have listened to him. (= but I didn't)
We can use never for emphasis with a negative verb:
I should never have bought it! (= I did buy it and now I regret it)


Grammar extra: If It wasn't for...
We can use if it wasn't/weren't for + noun phrase to say that a situation is dependent on another situation, person or thing:
If it wasn't/ weren't for the car, rd have no money worries now. (the car is the reason for my worries)
We can use if it hadn't been for to talk about a past situation:
If it hadn't been for your advice, I would have made the wrong decision.
IRREGULAR VERBS

be	was/were	been		lie	lay	lain
beat	beat	beaten		light	lit	lit
become	became	become		lose	lost	lost
begin	began	begun		make»	made	made
bend	bent	bent		mean	meant	meant
bet	bet	bet		meet	met	met
bite	bit	bitten		pay	paid	paid
bleed	bled	bled		put	put	put
blow	blew	blown		read	read	read
break	broke	broken		ride	rode	ridden
bring	brought	brought		ring	rang	rung
build	built	built		rise	rose	risen
burn	burnt	burnt		run	ran	run
burst	burst	burst		say	said	said
buy	bought	bought		see	saw	seen
catch	caught	caught		sell	sold	sold
choose	chose	chosen		send	sent	sent
come	came	come		set	set	set
cost	cost	cost		shake	shook	shaken
creep	crept	crept		shine	shone	shone
cut	cut	cut		shoot	shot	shot
deal	dealt	dealt		show	showed	shown
dig	dug	dug		shrink	shrank	shrunk
do	did	done		shut	shut	shut
draw	drew	drawn		sing	sang	sung
dream	dreamt	dreamt		sink	sank	sunk
drink	drank	drunk		sit	sat	sat
drive	drove	driven		sleep	slept	slept
eat	ate	eaten		slide	slid	slid
fell	fell	fallen		smell	smelt	smelt
feed	fed	fed		speak	spoke	spoken
feel	felt	felt		spell	spelt/spelled	spelt/spelled
fight	fought	fought		spend	spent	spent
find	found	found		spill	spilt	spilt
fly	flew	flown		split	split	split
forbid	forbade	forbidden		spoil	spoilt	spoilt
forget	forgot	forgotten		spread	spread	spread
forgive	forgave	forgiven		spring	sprang	sprung
freeze	froze	frozen		stand	stood	stood
get	got	got		steal	stole	stolen
give	gave	given		stick	stuck	stuck
go	went	gone		sting	stung	stung
grow	grew	grown		strike	struck	struck
hang	hung	hung		swear	swore	sworn
have	had	had		swell	swelled	swollen
hear	heard	heard		swim	swam	swum
hide	hid	hidden		swing	swung	swung
hit	hit	hit		take	took	taken
hold	held	held		teach	taught	taught
hurt	hurt	hurt		tear	tore	torn
keep	kept	kept		tell	told	told
kneel	knelt	knelt		think	thought	thought
know	knew	known		throw	threw	thrown
lay	laid	laid		understand	understood	understood
lead	led	led		wake	woke	woken
lean	leant	leant		wear	wore	worn
learn	learnt	learnt		weep	wept	wept
leave	left	left		win	won	won
let	let	let		write	wrote	written

GLOSSARY
Alternative hypothesis (H1)—The opposite of the null hypothesis (H0).
Analysis of variance (ANOVA)—A statistical method that tests the significance of different factors on a variable of interest.
Arithmetic mean—The balance point in a set of data that is calculated by summing the observed numerical values in a set of data and then dividing by the number of values involved.
Bar chart—A chart containing rectangles (“bars”) in which the length of each bar represents the count, amount, or percentage of responses of one category.