The Jehovah Witnesses reject the doctrine of the Trinity and deny the Biblical truth that the Holy Spirit is a distinct person in the Triune Godhead. You should memorize the following verses so that if this issue is ever brought up you will be prepared to give a Biblical defense of your faith. Among other things, these verses clearly prove that the Holy Spirit has a mind, a will, He can be blasphemed, He can be lied to, He intercedes with God for us, etc... If after hearing these verses, Jehovah Witnesses deny that the Holy Spirit is a person, then they must also conclude the same about themselves! So if the Holy Spirit is not a person, then we must conclude that neither are Jehovah Witnesses.
(THE) HOLY SPIRIT IS A PERSON: HE CAN BE BLASPHEMED Mat 12:31 "Therefore I say to you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven men.
HE CAN BE LIED TO Act 5:3 But Peter said, "Ananias, why has Satan filled your heart to lie to the Holy Spirit and keep back part of the price of the land for yourself?
HE HAS A MIND Rom 8:27 Now He who searches the hearts knows what the mind of the Spirit is, because He makes intercession for the saints according to the will of God.
HE HAS A WILL 1Co 12:11 But one and the same Spirit works all these things, distributing to each one individually as He wills.
HE INTERCEDES FOR THE SAINTS Rom 8:26 Likewise the Spirit also helps in our weaknesses. For we do not know what we should pray for as we ought, but the Spirit Himself makes intercession for us with groanings which cannot be uttered.
HE LOVES Rom 15:30 Now I beg you, brethren, through the Lord Jesus Christ, and through the love of the Spirit, that you strive together with me in prayers to God for me,
HE SPEAKS Joh 16:13 However, when He, the Spirit of truth, has come, He will guide you into all truth; for He will not speak on His own authority, but whatever He hears He will speak; and He will tell you things to come. Joh 16:14 He will glorify Me, for He will take of what is Mine and declare it to you.
Rom 8:16 The Spirit Himself bears witness with our spirit that we are children of God,
HE TEACHES Luk 12:12 For the Holy Spirit will teach you in that very hour what you ought to say."
Joh 14:25 "These things I have spoken to you while being present with you. Joh 14:26 But the Helper, the Holy Spirit, whom the Father will send in My name, He will teach you all things, and bring to your remembrance all things that I said to you.
1Co 2:12 Now we have received, not the spirit of the world, but the Spirit who is from God, that we might know the things that have been freely given to us by God. 1Co 2:13 These things we also speak, not in words which man's wisdom teaches but which the Holy Spirit teaches, comparing spiritual things with spiritual.
1Jn 2:27 But the anointing which you have received from Him abides in you, and you do not need that anyone teach you; but as the same anointing teaches you concerning all things, and is true, and is not a lie, and just as it has taught you, you will abide in Him.
NOTE HOW AN EVIL SPIRIT (WHICH HAS A WILL AND IS A PERSON) ENTERS SAUL AFTER THE HOLY SPIRIT LEFT HIM
1Sa 16:14 But the Spirit of the LORD departed from Saul, and a distressing spirit from the LORD troubled him.
PERSONAL PRONOUNS DESCRIBE HIM Isa 40:13 Who has directed the Spirit of the LORD, Or as His counselor has taught Him?
Joh 14:17 the Spirit of truth, whom the world cannot receive, because it neither sees Him nor knows Him; but you know Him, for He dwells with you and will be in you.
Joh 15:26 "But when the Helper comes, whom I shall send to you from the Father, the Spirit of truth who proceeds from the Father, He will testify of Me.
Of course they are many other verses that would add to the weight of this evidence; however, for this setting I do not doubt these clearly establish the Biblical truth that the Holy Spirit is indeed a person.