"Yo tengo una maleta."
Translation:I have a suitcase.
That is an expression in Spanish they use "to have" plus number of years, while in English we use "to be" plus number of years plus “old”. There are more: In Spanish they "have hunger, thirst , hot, cold......" while we "are hungry, thirsty, hot, cold..."
Also “tienen” can also be used for “ustedes” which is a plural formal form of “you” in Spain and plural form for Latin America. The plural familiar form is “vosotros tenéis” (“vosotras”, if the group you are talking to is all female) http://conjugator.reverso.net/conjugation-spanish-verb-tener.html
That would be "un maletin". They are not the same. It is smaller and carries business paperwork. https://dictionary.reverso.net/english-spanish/briefcase
Except that there is a different word or two for briefcase https://dictionary.reverso.net/english-spanish/briefcase
“Luggage” would work for a plural form as it is often more than one suitcase. It is actually a term used for which the items are not countable. It is usually translated as “el equipaje.” When you specify one suitcase, it should not be used.
In Spanish, unlike English, every word is either masculine or feminine. Most words that end in ‘a’ are feminine and they would require “una” instead of “un”. So, “una mujer” (a woman) and “un hombre” (a man) might have made sense to you, but you have to continue that with things: “una maleta” (a suitcase), “una puerta” (a door), un gato (a cat), un puerto (a port or harbor). So, it becomes important when you get to similar words such as port and door. Learning that port is masculine while door is feminine is useful. Adjectives must match the gender of the noun that they describe also.
You can look up words in a dictionary and ‘f’ means it is feminine while ‘m’ means it is masculine a noun might be indicated as “nf” or “nm”.
I personally recommend learning a word with its article “una maleta” or “la maleta” to memorize the gender at the same time. Most words that end in ‘o’ are masculine, but if you memorize “la mano” you will remember that the word for hand is feminine in Spanish.
« Une valise » is a French word. In Spanish, “una maleta” is the most common word, but we could try “una valija” which is an alternate word that is a bit closer to the word you like. Oh, I found out that “una valija” is only used in Argentina for suitcase. If you go to Mexico, they use “un veliz” which sounds even closer, but it is a masculine word in Spanish. http://www.wordreference.com/es/translation.asp?tranword=suitcase
If you speak French you might like this dictionary,
Ah, valija is also used in the term for diplomatic pouch. “Valija diplomática”
A briefcase is “un maletín.”
All words are either feminine or masculine in Spanish, even words for things. Feminine words take “la” for the definite article and “una” for the indefinite article and masculine words take “el” for the definite article and “un” for the indefinite article. Many words ending in ‘a’ are feminine and many words ending in ‘o’ are masculine, but not all, so it is best to learn each word with an article to know its gender. The masculine plural “the” is “los” and the feminine plural “the” is “las”. So more than one suitcase would be “las maletas”. “El hombre, los hombres, la mujer, las mujeres”
Funny, but that would be a different sentence. “Estoy en una maleta.”
Try listening to native speakers here: https://forvo.com/search/Yo%20tengo%20una%20maleta./