When is the subjunctive used
The mood of of doubt emotional probability personal will arbitrary approval or disapproval
Hablar subjunctive
Hable
Hables
Hable
Hablemos
Hablen
Comer (ir and er ending)
Coma Comamos
Comas
Coma Coman
The subjunctive uses first person singular as the root tener
Tenga Tengamos
Tengas
Tenga Tengan
When is the subjunctive used emotion
Es una lastima Que no vengen
It’s a shame that they are not coming
Use of subjunctive
Will preference necessity
Es importante Que pensemos en el futuro
It’s important that we think about the future
Irregular subjunctive haber
Haya Hayamos
Hayas
Haya. Hayan
Irregular subjunctive ir
Vaya Vayamos
Vayas
Vaya Vayan
Irregular subjunctive ser
Sea Seamos
Seas
Sea Sean
Irregular subjunctive saber
Sepa sepamos
Sepas
Sepa Sepan
Use of subjunctive approval disapproval
Esta bein Que hagas el examen el jueves en vez del martes
It’s OK for you to take the exam on Thursday instead of tues
Subjunctive = subjective
Subjunctive = subjective
Use of subjunctive negative
The subjunctive is also required. After expressions of emotion will preference and necessity or approval in the negative or interrogative.
No es possible Que Enrique fracase 
It’s not possible Enrique will fail 
Double negative no subjunctive
No Hay dudas de Que la biblioteca tiene ese libro
It’s not doubtful that the library has that book
Always subjunctive verbs dudar
To doubt
Always subjunctive verbs negar
To deny
Always subjunctive verbs alegrarse de
To be happy
Always subjunctive verbs esperar
To hope
Always subjunctive verbs sentir
To be sorry
Always subjunctive verbs sorprender
To surprise
Always subjunctive verbs Temer
To fear
Always subjunctive verbs Tener miedo
To be afraid of
Desear
To wish want
Decir (I)
To tell someone to do something