This is quite an easy one. Wherever you prefix an English verb with the word ‘would’, but without using the auxiliary verb ‘have’, you are using the conditional tense. Prefixing an English verb with the words ‘would have’ (‘I would have walked home’) is different – this would be the ‘conditional perfect’ tense (still in the conditional mood, but a different tense), so it is only if the verb concerned is immediately prefixed by ‘would’ in English.

Of course, the verb ‘have’ in itself could be prefixed with the word ‘would’ (‘They would have a pet cat, if…’), and this is conditional – it's only if ‘have’ is being used as an auxiliary verb that the tense would become the conditional perfect.

Examples of the conditional tense: ‘I would go, but I'm busy’; ‘He would walk home’; ‘They would not believe me’; ‘I would have a burger if I wasn't on a diet.’

Conditional tense of the first conjugation regular verb: trabalhar (to work)

trabalharia

trabalharíamos

trabalharias

trabalharíeis

trabalharia

trabalhariam

Conditional tense of the first conjugation regular verb: pensar (to think)

pensaria

pensaríamos

pensarias

pensaríeis

pensaria

pensariam

Conditional tense of the second conjugation regular verb: comer (to eat)

comeria

comeríamos

comerias

comeríeis

comeria

comeriam

Conditional tense of the second conjugation regular verb: escrever (to write)

escreveria

escreveríamos

escreverias

escreveríeis

escreveria

escreveriam

Conditional tense of the third conjugation regular verb: garantir (to guarantee)

garantiria

garantiríamos

garantirias

garantiríeis

garantiria

garantiriam

Conditional tense of the third conjugation regular verb: assistir (to attend)

assistiria

assistiríamos

assistirias

assistiríeis

assistiria

assistiriam

Irregular verbs in the conditional tense:

Conditional tense of the irregular first conjugation verb: estar (to be)

estaria

estaríamos

estarías

estaríeis

estaría

estariam

Conditional tense of the irregular second conjugation verb: ser (to be)

seria

seríamos

serias

seríeis

seria

seriam

Conditional tense of the irregular third conjugation verb: ir (to go)

iria

iríamos

irias

iríeis

iria

iriam