If you have a litter of young rabbits, it's important to be aware they can start breeding from as young as 12 weeks. This means that it's important to separate the rabbits into same sex groups before or around 3 months of age. It can be difficult to find the sex of a rabbit that is a few days old. You can attempt it at a younger age, but to definitively find the sex of your rabbits, wait until they are at least 4 weeks old. If you are not used to finding the sex of rabbits, it's best to start with an adult. If you have the parents of a litter of rabbits, you can take a look at the anatomy of the mother and father rabbit. This will help you see what a fully developed rabbit looks like. If you are still not confident, you can ask your veterinary clinic for help. Take your rabbits to your local veterinarian for help if necessary. Pick a rabbit to start with. Like most mammals, the rabbit's genitals are between its back legs. To see this area, the rabbit needs to lie on its back. It is helpful to have an extra person around to hold the rabbit so you have both hands free. Get your helper to sit in a chair and cover her lap with a towel. This is in case the rabbit urinates. Tell her to use one hand to grasp the rabbit's scruff and use her other hand to scoop under his rump. She should then lift and turn the rabbit onto his back. Lay the rabbit with his head towards her stomach and tail on the edge of her knees. This will give you easy access to the genital area. You may want to wear gloves since you are going to be touching a rabbit's genital regions. It is more hygienic as well as safer. You may unintentionally spread the disease to the rabbit or to your other rabbits if you don't. If you are checking a rabbit by yourself, flip the rabbit onto his back. To do this, place your index finger between the rabbit's ears and grasp the base of the head with your thumb on one side and your other three fingers on the other. With your other hand, cradle the rump and scoop the rabbit up. Once you have flipped your rabbit, place it between the arm holding the head and your body and let go of the rump. Your rabbit should be secure in one arm. You can also lay the rabbit on a low table. Gently but firmly hold them at all times. Make sure the table is low enough that, if the rabbit squirms enough to get away, jumping off the table won't injure him.
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One-sentence summary -- Determine the rabbit's age. Start with the older rabbits. Get the rabbit into position with assistance. Position the rabbit by yourself.

Remove the -ir ending from the infinitive and replace it with the appropriate ending to talk about present actions. The -ir endings are -o, -es, -e, -imos, is, and -en. For example: Yo abro: I open. Tu abres: You [informal] open. El/ella/usted abre: He/she opens; you [formal] open. Nosotros abrimos: We open. Vosotros abris: You all [informal] open. Ellos/ellas/ustedes abren: They/you all [formal] open. When you're discussing an action that doesn't extend at all into the present, the preterite tense is appropriate. Depending on your subject pronoun, you will replace the -ir with -i, -iste, -io, -imos, -isteis, or -ieron. Yo abri: I opened. Tu abriste: You [informal] opened. El/ella/usted abrio: He/she/you [formal] opened. Nosotros abrimos: We opened. Vosotros abristeis: You all [informal] opened. Ellos/ellas/ustedes abrieron: They/you all [formal] opened. When you're talking about something that happens habitually, or that was interrupted, conjugate your verb in the imperfect tense. For an -ir verb, this means replacing the -ir with -ia, ias, ia, -iamos, iais, or -ian. Yo abria: I was opening. Tu abrias: You [informal] were opening. El/ella/usted abria: He/she was opening; you [formal] were opening. Nosotros abriamos: We were opening. Vosotros abriais: You all [informal] were opening. Ellos/ellas/ustedes abrian: They/you all [formal] were opening. In Spanish, the conditional tense is used to describe actions that might happen, or that are dependent on some other condition to happen. Regular -ir verbs are conjugated using the same endings as the imperfect tense, added to the end of the infinitive rather than the verb stem. Yo abriria: I would open [if]. Tu abririas: You [informal] would open [if]. El/ella/usted abriria: He/she/you [formal] would open [if]. Nosotros abririamos: We would open [if]. Vosotros abririais: You all [informal] would open [if]. Ellos/ellas/ustedes abririan: They/you all [formal] would open [if]. Add an ending to the full infinitive to conjugate regular -ir verbs in future tense, just as you did with the conditional tense. Use the endings -e, -as, -a, -emos, -eis, and -an. Yo abrire: I will open. Tu abriras: You [informal] will open. El/ella/usted abrira: He/she/you [formal] will open. Nosotros abriremos: We will open. Vosotros abrireis: You all [informal] will open. Ellos/ellas/ustedes abriran: They/you all [formal] will open.
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One-sentence summary --
Use the present tense to describe actions currently happening. Switch to the preterite tense if the action happened in the past. Move to the imperfect tense if a past action continues to happen. Add the imperfect ending to the infinitive to express the conditional tense. Pick the future tense for talking about actions that will happen.