NO, u can't... First of all, what u need to know is that in Spanish, one can classify verbs into 3:
1. verbs ending AR: according to the subject, one must conjugate the verb. U delete AR and if we take into account the pronouns in English, those endings are:
I (yo) - o
you (tu) - as
she/he/it - (ella/el/esto) a
we (nosotros) - mos
they (ellos/ellas) an
Example: caminAR (walk)
yo (i) caminO
tu (you) caminAS
el/ella (he/she/it) caminA
nosotros (we) caminaMOS
ellos (they) caminAN
2. verbs ending ER: In this case u delete ER and add the following endings according to the subject:
I (yo) - o
you (tu) - es
she/he/it - (ella/el/esto) e
we (nosotros) - mos
they (ellos/ellas) en
Example: comER (eat)
yo (i) comO
tu (you) comES
el/ella (he/she/it) comE
nosotros (we) comeMOS
ellos (they) comEN
3. verbs ending IR: In this case, those verbs follow the same rule as verbs ending in AR
I (yo) - o
you (tu) - es
she/he/it - (ella/el/esto) e
we (nosotros) - mos
they (ellos/ellas) en
Example: pedIR (ask)
yo (i) pidO
tu (you) pidES
el/ella (he/she/it) pidE
nosotros (we) pediMOS
ellos (they) pidEN
However, this is a very simple rule because there are some irregular verbs whose conjugation changes... but with that simple rule u can construct simple sentences ;) and don't forget to add a complement to make the sentence with its full meaning ;)