Spanish yo-go verbs in the present subjunctive

In Spanish, so-called yo-go verbs, which have a spelling irregularly in the present indicative, have that same irregularity in the present subjunctive. The difference is that while in the present indicative only the yo form is affected by this stem change, in the present subjunctive all forms require the stem change. Have a look at these tables showing both the present indicative and the present subjunctive of tener (to have):

	TENER (present indicative)	TENER (present subjunctive)
yo	tengo	tenga
tú	tienes	tengas
él / ella / usted	tiene	tenga
nosotros / nosotras	tenemos	tengamos
vosotros / vosotras	tenéis	tengáis
ellos / ellas/ ustedes	tienen	tengan